The Loetschberg tunnel was built to connect Bern, Switzerland, with the ski resorts in the southern


Swiss Alps. This was accomplished by the Swiss using one engineering company that started at the


north end and another company that started at the south end. Suppose the company at the north end


could drill the entire tunnel in 22. 2 years and south company could do it in 21. 8 years. How long would


it have taken the two companies to drill the tunnel?

a. By using the recursive relation a₃ = 4, a₄ = 8, and a₅ = 16.  b. By assuming values and using mathematical induction proved aₙ = 2n-1 for all n ∈ ℕ.

a. Using the given recursive relation, we can calculate the values of a₃, a₄, and a₅ as follows:

a₃ = a₂ + 2a₁ = 2 + 2(1) = 4

a₄ = a₃ + 2a₂ = 4 + 2(2) = 8

a₅ = a₄ + 2a₃ = 8 + 2(4) = 16

Therefore, a₃ = 4, a₄ = 8, and a₅ = 16.

b. To prove the statement by Strong principle of mathematical induction, we must first establish a base case. From the given recursive relation, we have a₁ = 1 = 2¹ - 1, which satisfies the base case.

Now, assume that the statement is true for all values of k less than or equal to some arbitrary positive integer n. That is, assume that aₓ = 2x-1 for all x ≤ n.

We must show that this implies that aₙ = 2n-1. To do this, we can use the given recursive relation:

aₙ = aₙ-1 + 2aₙ-2

Substituting the assumption for aₓ into this relation, we get:

aₙ = 2n-2 + 2(2n-3)

aₙ = 2n-2 + 2n-2

aₙ = 2(2n-2)

aₙ = 2n-1

Therefore, assuming the statement is true for all values less than or equal to n implies that it is also true for n+1. By the principle of mathematical induction, we can conclude that the statement is true for all positive integers n.

Hence, we have proved that aₙ = 2n-1 for all n ∈ ℕ.

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Leo could buy 1.5 pounds of strawberries if they cost $2.80 per pound.

From the question, we have the following parameters that can be used in our computation:

3. 5lbs of strawberries that cost $4.20.

This means that

Cost = $4.20

Pounds = 3.5

For a unit rate of 2.8 we have

Pounds = 4.20/2.8

Evaluate

Pounds = 1.5

Hence, Leo could buy 1.5 pounds of strawberries if they cost $2.80 per pound.

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It seems like you're discussing a situation where a statement about school classes might be biased due to the inclusion of unnecessary words. Let's break it down:

1. The statement indicates that the situation is not random, meaning it's not a result of chance or lacking a pattern . It occurred after the school day and involved 54 students, which suggests it could be 1 or 2 classes.

2. The statement is considered biased because it includes words like "lengthy" and phrases like "which now extends for," which might be added to persuade students to agree with the speaker's point of view.

3. The percentage of students in favor of changing the situation is 6%.

In summary, the statement about school classes is not random, but it appears to be biased due to the inclusion of unnecessary words and phrases. The result is that only 6% of the students are in favor of changing the situation.

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The equilibrium quantity of the function is when x = 250

Given data ,

To find the equilibrium quantity, we need to find the quantity at which the demand and supply are equal

Let the functions be represented as d ( x  ) and s ( x )

Now , on simplifying the demand and supply ,

200 - 0.5x = 0.3x

Adding 0.5x on both sides , we get

200 = 0.8x

Divide by 0.8x , we get

x = 250

So , the equilibrium quantity is 250

And , To find the producer's surplus at the equilibrium quantity, we need to calculate the area between the supply curve and the equilibrium price line.

The producer's surplus represents the difference between the price at which producers are willing to supply goods and the actual market price

when x = 250

s ( x ) = 0.3 ( 250 )

s ( x ) = 75

So the equilibrium price is 75.

On simplifying the function ,

To calculate the producer's surplus, we need to find the area between the supply curve and the price line (which is the equilibrium price of 75) up to the quantity of 250. Since the supply function is a straight line, the area of the triangle can be calculated as:

Producer's Surplus = 0.5 * (Equilibrium Quantity) * (Equilibrium Price)

Producer's Surplus = 0.5 * 250 * 75

Producer's Surplus = 9375

Hence , the producer's surplus at the equilibrium quantity is 9375

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The most probable number of heads becomes more and more likely as the number of tosses increases.

Let's denote the probability of observing tails as q (which is 1/2 for a fair coin). Then the probability of observing exactly n heads in 4n tosses is given by the binomial distribution:

p(n) = (4n choose n) * (1/2)^(4n)

where (4n choose n) is the number of ways to choose n heads out of 4n tosses. We can express this in terms of the most probable number of heads, which is 2n:

p(n) = (4n choose n) * (1/2)^(4n) * (2^(2n))/(2^(2n))

= (4n choose 2n) * (1/4)^n * 2^(2n)

where we used the identity (4n choose n) = (4n choose 2n) * (1/4)^n * 2^(2n). This identity follows from the fact that we can choose 2n heads out of 4n tosses by first choosing n heads out of the first 2n tosses, and then choosing the remaining n heads out of the last 2n tosses.

Now we can express the ratio p(n)/p(2n) as:

p(n)/p(2n) = [(4n choose 2n) * (1/4)^n * 2^(2n)] / [(4n choose 4n) * (1/4)^(2n) * 2^(4n)]

= [(4n)! / (2n)!^2 / 2^(2n)] / [(4n)! / (4n)! / 2^(4n)]

= [(2n)! / (n!)^2] / 2^(2n)

= (2n-1)!! / (n!)^2 / 2^n

where (2n-1)!! is the double factorial of 2n-1. Note that (2n-1)!! is the product of all odd integers from 1 to 2n-1, which is always less than or equal to the product of all integers from 1 to n, which is n!. Therefore,

p(n)/p(2n) = (2n-1)!! / (n!)^2 / 2^n <= n! / (n!)^2 / 2^n = 1/(n * 2^n)

As n increases, the denominator n * 2^n grows much faster than the numerator (2n-1)!!, so the ratio p(n)/p(2n) approaches zero. This means that the probability of observing n heads relative to the most probable number of heads becomes vanishingly small as n increases, which is consistent with the intuition that the most probable number of heads becomes more and more likely as the number of tosses increases.

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The null and alternative hypotheses are: H0: σ21 = σ22 and Ha: σ21 ≠ σ22(C).

To find the critical value, we need to use the F-distribution with degrees of freedom (df1 = n1 - 1, df2 = n2 - 1) at a significance level of α/2 = 0.005 (since this is a two-tailed test).

Using a calculator or a table, we find that the critical values are F0.005(12,7) = 4.963 (for the left tail) and F0.995(12,7) = 0.202 (for the right tail).

The test statistic is calculated as F = s21/s22, where s21 and s22 are the sample variances and n1 and n2 are the sample sizes. Plugging in the given values, we get F = 5.7^2/5.1^2 = 1.707.

Since this value is not in the rejection region (i.e., it is between the critical values), we fail to reject the null hypothesis. Therefore, we do not have sufficient evidence to claim that the population variances are different at the 0.01 level of significance.

So C is correct option.

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Answer:

answer C!!

Step-by-step explanation:

Given  : sphere with radius 15.To find : Which expression gives the volume.Solution : We have given that radius of sphere = 15 units.Volume of sphere =  .Plugging the value of radius Volume of sphere =  .

The number of students that are science majors can be thought of as a binomial random variable because:

1. There are a fixed number of trials (students) in the sample.
2. Each trial (student) has only two possible outcomes: being a science major or not being a science major.
3. The probability of success (being a science major) remains constant for each trial (student).
4. The trials (students) are independent of each other, meaning the outcome for one student does not affect the outcomes of the other students.

These four characteristics satisfy the conditions of a binomial random variable, which is why the number of science majors among a group of students can be modeled using a binomial distribution.

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The means and standard deviations provided are enough to compare the scores in each subject by calculating their z-scores.

The information provided in the question is sufficient for you to compare your scores in each subject. To compare your scores in each subject, you would calculate the z-score for each of your grades. The z-score formula is (X - μ) / σ, where X is the grade, μ is the mean, and σ is the standard deviation.

After calculating the z-score for each subject, you can compare them to see which grade is above or below the mean. The z-scores can also tell you how far your grade is from the mean in terms of standard deviations. For example, a z-score of 1 means your grade is one standard deviation above the mean.

In conclusion, the means and standard deviations provided are enough to compare the scores in each subject by calculating their z-scores.

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The integrating factor of the given differential equation is I(t) = e^(sin(t)).

To find the integrating factor of the given differential equation, dy/dx = -cos(t)y t^2, follow these steps:

Rewrite the differential equation in the standard form:
(dy/dx) + P(t)y = Q(t), where P(t) and Q(t) are functions of t.

In our case, P(t) = cos(t) and Q(t) = -t^2.

Calculate the integrating factor, I(t), using the formula:
I(t) = e^(∫P(t) dt)

Here, P(t) = cos(t), so we need to integrate cos(t) with respect to t.

3. Integrate cos(t) with respect to t:
∫cos(t) dt = sin(t) + C, where C is the constant of integration. However, since we only need the function part for the integrating factor, we can ignore the constant C.

4. Substitute the integration result into the integrating factor formula:
I(t) = e^(sin(t))

So, the integrating factor of the given differential equation is I(t) = e^(sin(t)).

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After giving Jimmy one-third of the remaining candy pieces and Selena one-fourth of the remaining candy pieces, Bev is now down to having two-thirds as many as three-quarters as many as twenty-four pieces of candy.

Calculating how much candy is still available after each distribution is necessary if we want to establish how many pieces of candy Bev still possesses. At the beginning, Bev has twenty-four individual bits of candy. After giving Jimmy a third of the candy pieces, the number of pieces that are still remaining may be computed as (2/3) times 24, which is equal to two-thirds of the total amount.

The next thing that happens is that Bev gives Selena a quarter of the remaining candy pieces. We need to multiply the total amount that is still available by one quarter since Selena is entitled to a portion of what is left over after Jimmy has received his part. As a result, the remaining candy pieces can be approximated using the formula (3/4 * (2/3) * 24 after Selena has been given her portion.

The solution to the equation is found to be (3/4) * (2/3) * 24, which is 4 * 8, which equals 32. Therefore, after giving Jimmy one third of the remaining candy pieces and Selena one quarter of the remaining candy pieces, Bev still has 32 pieces of candy left.

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The normal distribution tails never go up again after crossing the horizontal axis. In a normal distribution, the tails of the curve represent the extreme values in either direction.

The tails of the curve extend infinitely in both directions and they get closer and closer to the horizontal axis, but they never touch it.

The curve is symmetrical around the mean and the area under the curve is equal to 1 or 100%.In probability theory, normal distribution is a continuous probability distribution that describes a set of random variables, and is often referred to as the Gaussian distribution. It is a bell-shaped curve and is characterized by the mean and standard deviation. It is an important concept in statistics and is used to describe various natural phenomena, such as heights, weights, IQ scores, etc.

The normal distribution is a bell-shaped curve that describes the distribution of a set of data. The curve is symmetrical around the mean, and the area under the curve is equal to 1 or 100%. The normal distribution is important in statistics because it is used to describe various natural phenomena. It is often used to describe the distribution of heights, weights, IQ scores, etc.

The normal distribution has a unique property that makes it useful in probability theory. The tails of the curve never touch the horizontal axis. The tails represent the extreme values in either direction, and they extend infinitely in both directions. They get closer and closer to the horizontal axis, but they never touch it. This means that the probability of observing an extreme value is very small. The normal distribution is an important concept in statistics, and it is used to make predictions about the future based on past observations.

The normal distribution is a bell-shaped curve that describes the distribution of a set of data. The tails of the curve never touch the horizontal axis. The tails represent the extreme values in either direction, and they extend infinitely in both directions. They get closer and closer to the horizontal axis, but they never touch it.

The normal distribution is important in probability theory and is often used to describe various natural phenomena. It is used to make predictions about the future based on past observations.

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Based on the crocodile skeleton found with a head length of 62 cm and a body length of 380 cm, it is likely that the species was a Saltwater Crocodile (Crocodylus porosus).

According to the given measurements, it is likely that the species was a Saltwater Crocodile (Crocodylus porosus).  This is because Saltwater Crocodiles are known to have larger sizes compared to other species.

To explain why, let's consider the following steps:

1. Compare the head length and body length to average sizes of different crocodile species.
2. Identify the species whose average size is closest to the given measurements.

Saltwater Crocodiles are the largest living species of crocodiles, with males reaching lengths of over 6 meters (20 feet). The head length of 62 cm and body length of 380 cm (3.8 meters) would likely be within the size range for an adult male Saltwater Crocodile. Other species, such as the Nile Crocodile or the American Alligator, typically do not reach such large sizes, making the Saltwater Crocodile a more plausible candidate based on the given measurements.

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The buffer capacity is at its maximum when the pH of the solution is equal to the pKa of the acid in the buffer system.

The buffer capacity is at a maximum when the pH is equal to the pKa of the acid-base system and can be calculated using the formula: log [A-]/[HA], where [A-] represents the concentration of the conjugate base and [HA] represents the concentration of the acid.

When the pH is equal to the pKa, the concentrations of the acid and its conjugate base are equal. This balanced ratio maximizes the buffer capacity because any addition of acid or base to the system is efficiently neutralized by the equilibrium between the acid and its conjugate base.

At this pH, a small amount of acid or base will cause only a minimal change in the pH of the solution, making the buffer highly resistant to pH changes. Consequently, the buffer capacity is at its maximum, indicating the buffer's effectiveness in maintaining a stable pH.

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The decomposition of wood alcohol (CH3OH) to produce methane (CH4) and oxygen (O2) at 25°C and 1 atm is not thermodynamically feasible.

To explain further, we can consider the enthalpy change (∆H) associated with the reaction. The decomposition of wood alcohol can be represented by the equation:

CH3OH → CH4 + 1/2O2

By comparing the standard enthalpies of formation (∆Hf) for each compound involved, we can determine the overall enthalpy change of the reaction. The standard enthalpy of formation for wood alcohol (∆Hf(CH3OH)) is known to be negative, indicating its formation is exothermic. However, the standard enthalpy of formation for methane (∆Hf(CH4)) is more negative than the sum of ∆Hf(CH3OH) and 1/2∆Hf(O2).

This means that the formation of methane and oxygen from wood alcohol would require an input of energy, making it thermodynamically unfavorable at 25°C and 1 atm. Therefore, under these conditions, the decomposition of wood alcohol to methane and oxygen would not occur spontaneously.

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The best lower bound for the volume is 24 cm³, and the best upper bound is 120 cm³ and the best lower bound for the surface area is 52 cm², and the best upper bound is 148 cm².

a. To determine the best upper and lower bounds for the volume of the rectangular parallelepiped, we can consider the extreme cases by rounding each side to the nearest centimeter.

Lower bound: If we round each side down to the nearest centimeter, we get a rectangular parallelepiped with sides 2 cm, 3 cm, and 4 cm. The volume of this parallelepiped is 2 cm * 3 cm * 4 cm = 24 cm³.

Upper bound: If we round each side up to the nearest centimeter, we get a rectangular parallelepiped with sides 4 cm, 5 cm, and 6 cm. The volume of this parallelepiped is 4 cm * 5 cm * 6 cm = 120 cm³.

Therefore, the best lower bound for the volume is 24 cm³, and the best upper bound is 120 cm³.

b. Similar to the volume, we can determine the best upper and lower bounds for the surface area of the parallelepiped by considering the extreme cases.

Lower bound: If we round each side down to the nearest centimeter, the dimensions of the parallelepiped become 2 cm, 3 cm, and 4 cm. The surface area is calculated as follows:

2 * (2 cm * 3 cm + 3 cm * 4 cm + 4 cm * 2 cm) = 2 * (6 cm² + 12 cm² + 8 cm²) = 2 * 26 cm² = 52 cm².

Upper bound: If we round each side up to the nearest centimeter, the dimensions become 4 cm, 5 cm, and 6 cm. The surface area is calculated as follows:

2 * (4 cm * 5 cm + 5 cm * 6 cm + 6 cm * 4 cm) = 2 * (20 cm² + 30 cm² + 24 cm²) = 2 * 74 cm² = 148 cm².

Therefore, the best lower bound for the surface area is 52 cm², and the best upper bound is 148 cm².

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The total discount given on 3000 letters posted at a cost of 36 cents each, with a 40% discount, amounts to $432.

To calculate the total discount given, we first need to determine the original cost of posting 3000 letters. Each letter had a cost of 36 cents, so the total cost without any discount would be 3000 * $0.36 = $1080.

Next, we calculate the discount amount. The discount is given as 40% of the original cost. To find the discount, we multiply the original cost by 40%:

$1080 * 0.40 = $432.

Therefore, the total discount given on 3000 letters is $432. This means that the company saved $432 on their mailing expenses through the applied discount.

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During one complete revolution, the lawn roller covers approximately 2713.72 square inches of area.

A lawn roller in the shape of a right circular cylinder has a diameter of 18 inches and a length of 4 feet.

To find the area rolled during one complete revolution of the roller, we need to calculate the lateral surface area of the cylinder.

First, let's convert the length to inches: 4 feet = 48 inches.

The formula for the lateral surface area of a cylinder is 2πrh, where r is the radius and h is the height (length).

Since the diameter is 18 inches, the radius is 9 inches (18/2).

Plugging in the values, we get:

2π(9)(48) = 2π(432) ≈ 2713.72 square inches.

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Answer:

the answer is B 25 calories/1 ounce

explanation:

6 ounce/150 calories = X/ 1 calories

= 25/1

the point on the hyperboloid where the tangent plane is parallel to the plane z = 6x + 6y is (3, -3, 1/2).

To find the points on the hyperboloid where the tangent plane is parallel to the plane z = 6x + 6y, we need to first find the gradient vector of the hyperboloid at any point (x, y, z) on the hyperboloid.

The gradient of x^2 - y^2 - z^2 = 9 is given by:

grad(x^2 - y^2 - z^2 - 9) = (2x, -2y, -2z)

Now, we need to find the points on the hyperboloid where the gradient vector is parallel to the normal vector of the plane z = 6x + 6y, which is given by (6, 6, -1).

Setting the components of the gradient vector and the normal vector equal to each other, we get the following system of equations:

2x = 6

-2y = 6

-2z = -1

Solving for x, y, and z, we get:

x = 3

y = -3

z = 1/2

So, the point on the hyperboloid where the tangent plane is parallel to the plane z = 6x + 6y is (3, -3, 1/2).

To verify that the tangent plane is parallel to the given plane, we can find the gradient of the hyperboloid at this point, which is (6, 6, -1), and take the dot product with the normal vector of the given plane, which is (6, 6, -1). The dot product is equal to 72, which is nonzero, so the tangent plane is parallel to the given plane.

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Musk is 12 years old, Abu is 18 years old and the sum of their ages is 30.

Let's find out the current ages of Musk and Abu from the given information.

Musk's age is 2/3 of Abu's age.

We can express it as; Musk's age = 2/3 × Abu's age Also, the sum of their age is 30.

So we can express it as: Musk's age + Abu's age = 30

Substitute the first equation into the second one:2/3 × Abu's age + Abu's age = 30

Simplify the equation and solve for Abu's age:5/3 × Abu's age = 30Abu's age = 18

Substitute Abu's age into the first equation to find Musk's age:

Musk's age = 2/3 × 18Musk's age = 12

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The 95% confidence interval is 1.23 to 1.51

From the question, we have the following parameters that can be used in our computation:

Sample, n = 22

Mean, x = 1.37 oz

Standard deviation, s = 0.33 oz

Start by calculating the margin of error using

E = s/√n

So, we have

E = 0.33/√22

E = 0.07

The 95% confidence interval is

CI = x ± zE

Where

z = 1.96 i.e. z-score at 95% CI

So, we have

CI = 1.37 ± 1.96 * 0.07

Evaluate

CI = 1.37 ± 0.14

This gives

CI = 1.23 to 1.51

Hence, the 95% confidence interval is 1.23 to 1.51

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The statement that correctly compares the two functions is B, They have the same y-intercept but different end behavior.

From the graph that the exponential function passes through the points (-0.5, 8), (0, 4), (1, 1), and (5, 0). Use this information to find the equation of the exponential function.

Assume that the exponential function has the form f(x) = a × bˣ, where a and b = constants to be determined, use the points (0, 4) and (1, 1) to set up a system of equations:

f(0) = a × b⁰ = 4

f(1) = a × b¹ = 1

Dividing the second equation by the first:

b = 1/4

Substituting this value of b into the first equation:

a = 4

So the equation of the exponential function is f(x) = 4 × (1/4)ˣ = 4 × (1/2)²ˣ.

Now, compare the two functions. Since the exponential function has a y-intercept of 4, and the equation of the other function is not given.

However, from the graph that the exponential function approaches the x-axis (i.e., has an end behavior of approaching zero) as x gets larger and larger. Therefore, the exponential function and the other function have different end behavior.

So the correct answer is (B) "They have the same y-intercept but different end behavior."

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The distance from the plane 10x y z=90 to the plane 10x y z=70, we need to find the distance between a point on one plane and the other plane. The distance from the plane 10x y z=90 to the plane 10x y z=70 is 10sqrt(2) units.

Take the point (0,0,9) on the plane 10x y z=90.
The distance between a point and a plane can be found using the formula:
distance = | ax + by + cz - d | / sqrt(a^2 + b^2 + c^2)
where a, b, and c are the coefficients of the x, y, and z variables in the plane equation, d is the constant term, and (x, y, z) is the coordinates of the point.
For the plane 10x y z=70, the coefficients are the same, but the constant term is different, so we have:
distance = | 10(0) + 0(0) + 10(9) - 70 | / sqrt(10^2 + 0^2 + 10^2)
distance = | 20 | / sqrt(200)
distance = 20 / 10sqrt(2)
distance = 10sqrt(2)
Therefore, the distance from the plane 10x y z=90 to the plane 10x y z=70 is 10sqrt(2) units.

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Answer:

k = [tex]\frac{12}{5}[/tex]

Step-by-step explanation:

[tex]\frac{12}{5}[/tex] = [tex]\frac{1}{6k}[/tex] ( cross- multiply )

72k = 5 ( divide both sides by 72 )

k = [tex]\frac{5}{72}[/tex]

Answer: k=8.4 or 42/5

Step-by-step explanation: to find k you take 1 2/5 and divide it by 1/6. When I did it I got 8.4. To check my work I replaced the variable in the equation and it was correct.

Molarity: A solution is defined as the number of moles of solute present in 1 liter of the solution. It is represented by Molarity = Number of moles of solute / Volume of solution in Liters.

Given: The solution has 160.0 g of H2SO4 in 0.500 L.
The molarity of the solution can be calculated as follows:
Step 1: Calculate the number of moles of H2SO4 present in the solution:
The molecular mass of H2SO4 = (2 × 1.008) + (1 × 32.06) + (4 × 15.999) = 98.08 g/mol
Number of moles of H2SO4 = Mass of H2SO4 / Molecular mass of H2SO4
= 160.0 g / 98.08 g/mol
= 1.63 mol

Step 2: Calculate the molarity of the solution:
Molarity = Number of moles of solute / Volume of solution in Liters
= 1.63 mol / 0.500 L
= 3.26 M
Therefore, the molarity of the given solution is 3.26 M (Molar).

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Answer:

16 mm

Step-by-step explanation:

P = 2(L + W)

P = 2(2 mm + 6 mm)

P = 2(8 mm)

P = 16 mm

Mr. Baral has to pay Rs 64000 as an annual income tax at an interest of 10% for his stationary shop.

From the question, we have given that if he is unmarried and his income is between Rs 5,00,001 to Rs 7,00,000, he has to pay an annual interest of 10%.

Given annual income in Rs = 640000.

The annual income tax rate he has to pay at = 10%

So, to find out the income tax from the annual income we have to find out the 10% of 640000.

Income tax = 640000/100 * 10 = 64000

From the above analysis, we can conclude that Mr. Baral has to pay 64000 rs of income tax annually.

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Given question is not having enough information, I am writing the complete question below:

Use it to calculate the income taxes. For an individual Income slab Up to Rs 5,00,000 0% Rs 5,00,001 to Rs 7,00,000 10% Rs 7,00,001 to Rs 10,00,000 20% Rs 10,00,001 to Rs 20,00,000 30% Tax rate For couple Tax rate 0% Income slab Up to Rs 6,00,000 Rs 6,00,001 to Rs 8,00,000 Rs 8,00,001 to Rs 11,00,000 20% Rs 11,00,001 to Rs 20,00,000 30%

a) Mr. Baral has a stationery shop. His annual income is Rs 6,40,000. If he is unmarried, how much income tax should he pay? 10%​

The correct expressions which model the value of the phone after t years are given by 300(0.87)t/12 and 300(0.9885)t. Value of a cellular phone depreciates at a rate of 13% every month.

Given a cellular phone's value depreciates at a rate of 13% every month. So, the phone's value will decrease by 13% of its original value every month. Therefore, the equation for the phone's value after t years is given by:

V(t) = $300 × (1 - 0.13)ᵗ, where t is the time in years.

The given expressions, 300(0. 87)/12 and 300(0. 1880)t 300(0. 87)t/12 and 300(0. 9885)t 300(0. 87)124 and 300(0. 1880)t 300(0. 87) 12 and 300(0. 9885)t. Do not model the value of the phone after t years. Therefore, the correct answer is 300(0. 87)t/12 and 300(0. 9885)t.

The value of a cellular phone depreciates at a rate of 13% every month, which means that the remaining value of the phone after one month is 87% of the original value. Therefore, to calculate the value after t years, the equation

V(t) = $300 × (1 - 0.13)ᵗ should be used.

By plugging in the time t in years, we can get the remaining value of the phone. The first option (300(0.87)/12 must be corrected because it only calculates the phone's value after one month, which is not the question asked. Therefore, the correct expression that model the phone's value after t years is given by 300(0.87)t/12 and 300(0.9885)t.

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The price of a First-Class stamp in 2021 was 4.46 times as great as the price of Tubman's stamp.

The price of Harriet Tubman's First-Class stamp was 13 cents.

In 2021, the price of a First-Class stamp was $0.58.

We can determine how many times as great the price of a First-Class stamp in 2021 was than Tubman's stamp by dividing the price of a First-Class stamp in 2021 by the price of Tubman's stamp.

So, 0.58/0.13

= 4.46 (rounded to two decimal places)

Thus, the price of a First-Class stamp in 2021 was 4.46 times as great as the price of Tubman's stamp.

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