Giving Brainliest!!!

Answer: 20.93

Step-by-step explanation:

2.99x7

Answer:

sum of 5 and 7

Step-by-step explanation:

5+7

sum means an adding equetion

Answer:

The answer is 2.5

Step-by-step explanation:

° The sum of 5 and 7 is 5 + 7 = 12

° The quotient of means "the result got from dividing one variable by another", so, 30/12 = 2.5

The length of the remaining piece of beam as polynomial is 6y²⁺⁷⁺¹¹

An algebraic expression with two or more algebraic terms is known as a polynomial.It has exponents, operators, coefficients, coefficients, variables, and constants.  A polynomial is a mathematical expression that solely uses the operations addition, subtraction, multiplication, and non-negative integer powers of variables. It is made up of indeterminates (also known as variables) and coefficients.

The length of the wooden beam is (7y²⁺⁷⁺¹) meters long and a piece of length (y²⁻¹⁰) meters is cut off ¹.

Therefore, the length of the remaining piece of beam can be expressed as follows:

(7y²⁺⁷⁺¹)-(y²⁻¹⁰) = 6y²⁺⁷⁺¹¹

So, the length of the remaining piece of beam is 6y²⁺⁷⁺¹¹

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The length in this instance is accurately measured at 21 cm to two significant figures.

1. Upper Bound:

The upper bound is the highest possible value that the measurement could have while still being correct to 2 significant figures.

In 21 cm, the last significant figure is 1.

The next possible value after 1 is 2.

So, half of the difference between 2 and 1 is 0.5.

Upper Bound = 21 + 0.5

                       = 21.5 cm

2. Lower Bound:

In 21 cm, the last significant figure is 1, and the next possible value after 1 is 2. So, half of the difference between 1 and 2 is 0.5.

Lower Bound = 21 - 0.5

                       = 20.5 cm

Therefore, the upper bound is 21.5 cm and the lower bound is 20.5 cm.

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The total depletion layer width is 0.982 μm, the built-in potential is 0.84 V, and the maximum field at zero bias is 3.72 x 105 V/cm.

In a diffused silicon p-n junction, the p-side has a linearly graded junction with a doping concentration profile given by a = 3 x 1019/cm4, while the n-side has a uniform doping concentration of 5 x 1014/cm3. The depletion layer width on the p-side at zero bias is given as 0.6 μm.

To find the total depletion layer width, we need to first find the doping concentration at the junction on the p-side. We can do this using the relation:

[tex]Na2 = Ndp2 + 2εφbi/q(a2 - 2/3 a3)[/tex]

Where Na is the acceptor concentration, Ndp is the donor concentration on the p-side, φbi is the built-in potential, q is the electronic charge, a2 and a3 are the second and third terms of the dopant concentration expansion, and ε is the permittivity of the material.

Using the given values, we can find the acceptor concentration on the p-side to be Na = 1.35 x 1017/cm3. Then, we can find the depletion layer width on the n-side using the relation:

[tex]Wn = sqrt((2εφbi/ q)(Na/Nd - 1))[/tex]

where Nd is the doping concentration on the n-side. Since the n-side has a uniform doping concentration, we can use the given value of 5 x 1014/cm3 to find Wn = 0.382 μm.

The total depletion layer width is then the sum of the depletion layer widths on both sides, i.e., W = Wp + Wn = 0.6 + 0.382 = 0.982 μm.

To find the built-in potential, we can use the relation:

[tex]φbi = kT/q ln(NaNd/ni2)[/tex]

where k is the Boltzmann constant, T is the temperature, and ni is the intrinsic carrier concentration. Using the given values and assuming room temperature, we can find φbi to be 0.84 V.

The maximum electric field occurs at the junction and can be found using the relation:

[tex]Emax = sqrt(2qNaεφbi) / W[/tex]

Using the given values, we can find Emax to be 3.72 x 105 V/cm.

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Again, withοut a diagram οr mοre cοntext, it's difficult tο say fοr certain if cοοrdinates  this is the cοrrect answer, but it is οne pοssible apprοach tο the prοblem based οn the infοrmatiοn prοvided.

In mathematics, a cοοrdinate is a number οr permutatiοn οf integers that indicates the lοcatiοn οf a pοint οr οbject in space. Cοοrdinates are frequently used tο define a pοint οr οbject's pοsitiοn in a specific reference frame, such as the Euclidean οr antarctic cοοrdinate systems.

In the Cartesian cοοrdinate system, a pοint is lοcated by its distance frοm the οrigin alοng the x-axis and its distance first frοm οrigin alοng the y-axis. These distances are represented by twο numbers, its x-cοοrdinate and the y-cοοrdinate. The pοint's pοsitiοn in the plane is specified by the twο cοοrdinates.

If "p || q" means that lines p and q are parallel, then we can use the fact that alternate interiοr angles are cοngruent tο sοlve the prοblem. Angles οn οppοsite sides οf the transversal (in this case, line u) and within the twο parallel lines are equal.

Sο, if we knοw which angles are alternate interiοr angles, we can use that knοwledge tο calculate the measure οf angle v.

m∠u = m∠w

75.8° = 104.2° - m∠v

m∠v = 28.4°

Again, withοut a diagram οr mοre cοntext, it's difficult tο say fοr certain if this is the cοrrect answer, but it is οne pοssible apprοach tο the prοblem based οn the infοrmatiοn prοvided.

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Complete Question;

Building more schools could lead to more robberies.

what is sample space?

In probability theory, the sample space is the set of all possible outcomes of a random experiment or process. It is denoted by the symbol "S".

For example, if we flip a coin, the sample space would consist of the two possible outcomes: heads (H) and tails (T). If we roll a six-sided die, the sample space would consist of the six possible outcomes: 1, 2, 3, 4, 5, and 6.

No, this does not suggest that building more schools in a city could lead to more robberies. Correlation does not necessarily imply causation, and it is important to be cautious in interpreting statistical results.

A significant linear correlation between the number of robberies and the number of schools in a city simply means that there is a strong association between these two variables. It does not provide evidence of causation. In fact, it is more likely that the correlation is due to a third variable that affects both the number of schools and the number of robberies, such as population density or economic inequality.

Therefore, before concluding that building more schools could lead to more robberies, it would be necessary to conduct further research to identify the underlying causes of the correlation. Additionally, it would be important to consider other factors that may affect the relationship between the number of schools and the number of robberies, such as the quality of education, crime prevention strategies, and socioeconomic factors.

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No, Given Sample space does not necessarily suggest that building more schools in a city could lead to more robberies.

What exactly is a sample space?

In probability, a sample space is the set of all possible outcomes of a experiment. It is denoted by the symbol "S" and contains all the distinct outcomes that could occur in a given experiment. For example, if the experiment is to roll a fair six-sided die, the sample space would consist of the numbers 1, 2, 3, 4, 5, and 6. Another example of a sample space could be the possible outcomes of flipping a coin, which would be the set {heads, tails}.

Now,

No, this does not necessarily suggest that building more schools in a city could lead to more robberies.

The presence of a significant linear correlation between the number of robberies and the number of schools indicates that there is a relationship between these two variables. However, correlation does not imply causation. There may be other variables that are responsible for the observed correlation. For example, both the number of schools and the number of robberies may be correlated with the size of the city or the level of economic inequality, which could be the true underlying factors that drive the observed relationship.

Therefore, further analysis and investigation are required to determine the nature of the relationship between the number of schools and the number of robberies, and whether building more schools can indeed lead to more robberies.

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Based on the similarity theorem, the values are:

6. x = 21; 7. <H = <B, GH/DJ = AB/DC; 8. x = 11

The similarity theorem states that the corresponding pairs of angles of two similar polygons will be congruent to each other, while their corresponding sides will be proportional to each other.

Therefore, we have:

6. x/7 = 12/4

x/7 = 3

x = 21

7. Both polygons are similar, therefore:

<H = <B, while GH/DJ = AB/DC

8. 2x - 4/6 = 9/3

2x - 4/6 = 3

2x - 4 = 18

2x = 18 + 4

2x = 22

x = 11

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Answer: 4.8

Step-by-step explanation: 268.8 divided by 56 is 4.8

The sample space for Ted's experiment is TTT, TTH, THT, HHH, HHT, HTH, THH, HTT ( option C)

The sample space of a random experiment is the collection of all possible outcomes.

When we toss a coin, there can be only two outcomes i.e., either head or tail. So, the sample space will be, S = {H, T} where H is the head and T is the tail.

When Ted tossed the coin three times, the sample space include;

TTT, TTH, THT, HHH, HHT, HTH, THH, HTT

This means the total sample space is 8.

Therefore the sample space for Ted's experiment is TTT, TTH, THT, HHH, HHT, HTH, THH, HTT

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Answer: 144

Step-by-step explanation:

Amount of numbers in the simulation between 1 & 4 (inclusive): 15 out of a total 25

15 / 25 = 0.6

0.6 * 240 = 144 students

Answer:

A) x = 13

Step-by-step explanation:

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the opposite. Do the opposite of PEMDAS.

PEMDAS is the order of operations, and stands for:

Parenthesis

Exponents (& roots)

Multiplications

Divisions

Additions

Subtractions

~

First, root both sides of the equation to eliminate the power:

[tex](x -7)^2 = (36)\\\sqrt{(x-7)^2} = \sqrt{36} \\x - 7 = 6[/tex]

Next, isolate the variable, x, by adding 7 to both sides of the equation:

[tex]x - 7 = 6\\x - 7 (+7) = 6 (+7)\\x = 6 + 7\\x = 13[/tex]

x = 13, or A) is your answer.

~

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The given data in this problem allows for the creation of a system with three variables, that represent the earnings from the sales in the three days, by solving this system we can obtain these following sale prices:

The sale price for each sweater is obtained solving a system of equations.

The variables of the system of equations are given as follows:

Considering the profits for each day, along with the amounts of each sweater sold, the equations that compose the system are given as follows:

Inserting these three equations into a calculator, the solution to the system of equations is given as follows:

x = 15, y = 20, z = 45.

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The probability that the sample proportion of customers who are happy with the food quality is between 70% and 77% is 0.693

Andy is a restaurant owner who believes that 72% of his customers are happy with the food quality of his restaurant. What are the probabilities for the following questions, given a random sample of 78 customers? Probability that less than 57 customers are satisfied with the food quality:To find the probability that less than 57 customers are happy with the food quality, we'll first compute the z-score.Z = (x - µ) / σZ = (56.5 - 72.84) / 4.392 Z = -3.7 Using the table, we can find that the probability of a z-score less than -3.7 is 0.0001. Thus, the probability that less than 57 customers are happy with the food quality is 0.0001.

Probability that at least 57 customers are satisfied with the food quality:The probability that at least 57 customers are satisfied with the food quality is the complement of the probability that less than 57 customers are satisfied with the food quality. Hence, the answer is: 1 - 0.0001 = 0.9999 Probability that the sample proportion of customers who are satisfied with the food quality is between 70% and 77%:To calculate the probability that the sample proportion of customers who are happy with the food quality is between 70% and 77%, we'll need to compute the z-scores for both values.

The z-score is given by Z = (p - P) / sqrt(PQ/n), where P is the true proportion (0.72), Q is 1 - P (0.28), and n is the sample size (78).Z1 = (0.70 - 0.72) / sqrt(0.72*0.28/78) = -0.85Z2 = (0.77 - 0.72) / sqrt(0.72*0.28/78) = 1.24The probability is the difference between the two probabilities of the standard normal distribution, which is 0.8907 - 0.1977 = 0.693. Hence, the probability that the sample proportion of customers who are happy with the food quality is between 70% and 77% is 0.693.

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B. Both the mean and median will decrease, but the mean will decrease by more than the median.

Since the wheel of cheese has a much higher cost than the other 11 items, removing it will decrease the overall mean cost of the items purchased. However, the median, which is the middle value when the items are arranged in order, will also decrease but not by as much as the mean since it is not as affected by outliers like the wheel of cheese.

The mean is calculated by taking the sum of all the prices and dividing it by the number of items, so removing the most expensive item (the wheel of cheese) will decrease the sum of prices and thus decrease the mean.

The median is the middle value when all the prices are arranged in order. Since the wheel of cheese is the most expensive item, it will be the last item on the ordered list. Removing it will not change the position of any other items, so the median will simply be the middle value of the remaining 11 items. The value of the median is not affected by the price of the wheel of cheese, so the median will also decrease but only by a small amount. T

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The correct question should be:

Chucky grabbed 12 items in the grocery store that each had a different price and had a mean cost of about $7.41. One of the items was an entire wheel of cheese that cost $39.99. Chucky then decided to put the wheel of cheese back and only buy the other 11 items. How will removing the wheel of cheese affect the mean and median?

A. Both the mean and median will decrease, but the median will decrease by more than the mean.

B. Both the mean and median will decrease, but the mean will decrease by more than the median.

C. Both the mean and median will increase, but the median will increase by more than the mean.

D. Both the mean and median will increase, but the mean will increase by more than the median.

Step-by-step explanation:

6(-3.8y-11.2)

-22.8y-67.2

answer: -22.8y-67.2

Answer: -22.8y - 67.2

Step-by-step explanation: You multiply the number inside of () by whatever number is on the outside, which is 6.

6 x -3.8

6 x 3 = 18

6 x .8 = 4.8

then add on your negative symbol

-22.8

6 x 11 = 66

6 x .2 = 1.2

add them together

67.2

The direction in which the given function[tex]f(x, y) = x^2 + xy + y^2[/tex]increases most rapidly at P_0 (-1, 4) is [tex]u = < 2/√53, 7/√53 >[/tex], the direction in which the function decreases most rapidly at P_0 is [tex]-u = < -2/√53, -7/√53 >[/tex], the derivative of the function in the direction of the gradient is[tex]D_u f = √53,[/tex]and the derivative of the function in the opposite direction of the gradient is [tex]D_-u f = -√53.[/tex]

The direction in which a function increases most rapidly at a given point is the direction of the gradient of the function at that point. The gradient of the function [tex]f(x, y) = x^2 + xy + y^2[/tex] is given by:
[tex]∇f = < 2x + y, x + 2y >[/tex]


At the point P_0 (-1, 4), the gradient is:[tex]∇f(P_0) = < 2(-1) + 4, -1 + 2(4) > = < 2, 7 >[/tex]
The direction in which the function increases most rapidly at P_0 is the unit vector in the direction of the gradient:
[tex]u = ∇f(P_0)/||∇f(P_0)|| = < 2/√53, 7/√53 >[/tex]
The direction in which the function decreases most rapidly at P_0 is the opposite of the direction of the gradient:[tex]-u = < -2/√53, -7/√53 >[/tex]


The derivative of the function in the direction of the gradient is the dot product of the gradient and unit vector in the direction of the gradient:
[tex]D_u f = ∇f(P_0) · u = < 2, 7 > · < 2/√53, 7/√53 > = (4 + 49)/√53 = 53/√53 = √53[/tex]


The derivative of the function in the opposite direction of the gradient is the dot product of the gradient and the unit vector in the opposite direction of the gradient:
[tex]D_-u f = ∇f(P_0) · -u = < 2, 7 > · < -2/√53, -7/√53 > = (-4 - 49)/√53 = -53/√53 = -√53[/tex]


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For the plotted point P on the given number line, the number represented by point P is 5.80⁻³.

A number line is a linear visual representation of numbers and integers. This line is used to compare equally spaced numbers on an infinite line that extends horizontally or vertically on either side. A number line shows point values ​​and equal divisions on the line.

There are 10 points at equal intervals that falls between point 5.10⁻³ and point 6.10⁻³.

Counting from the very left the points are as follows:

5.10⁻³, 5.20⁻³, 5.30⁻³, 5.40⁻³, 5.50⁻³, 5.60⁻³, 5.70⁻³, 5.80⁻³, 5.90⁻³, 6.00⁻³, 6.10⁻³.

Point P falls on 5.80⁻³, therefore the value of point P is 5.80⁻³.

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The complete question is as follows:

Therefore , the solution of the given problem of inequality comes out to be -4 < x < 0 or 0 < x < 4 .

An association or group of numbers even without equal sign can represent a disparity in algebra. Equilibrium is always followed by equity. Inequality occurs when norms are still incompatible. Disparity and fairness have different traits. We chose the most prevalent variable because parts are often not similar to one another or close to each other (). It is also possible to evaluate values using disparities of any size.

Here,

"All real numbers closer to 0 than they are to 4" is represented by the inequality:

=> |x - 0| < |x - 4|

When we simplify this inequality, we obtain:

=> |x| < |x - 4|

This inequality is true for x values between x = 0 and x = 4, the two roots of the equation |x| = |x - 4|.

Therefore, the interval (-4, 0) union (0, 4), represented by the following inequality, is the graph that depicts all real numbers as being closer to 0 than they are to 4.

=> -4 < x < 0 or 0 < x < 4

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The option B because it’s the real numbers closer 0 then they are at 4.

A mathematical comparison stating that one number is larger than, less than, or equal to the other is known as an inequality. Inequalities are written using symbols such as < (less than), > (greater than), ≤ (less than or equal to), or ≥ (greater than or equal to).

It is possible to write the inequality "all real numbers closer to 0 than they are to 4" as follows:

[tex]| x - 0 | < | x - 4 |[/tex]

where |  | represents the absolute value function. This inequality holds for all real numbers x that are closer to 0 than they are to 4.

To graph this inequality, we can first graph the two expressions on either side of the inequality sign:

[tex]y = | x - 0 | = | x |[/tex]

and, [tex]y = | x - 4 |[/tex]

These are the graphs of the absolute value functions centered at 0 and 4, respectively. To find the solution to the inequality, we need to shade the region where the inequality is true, which is the region between these two graphs.

So the option B because it’s the real numbers closer 0 then they are at 4.

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Answer: 3 times per second

Step-by-step explanation:

Orland skipped 135 times in 45 seconds, so you divide 135/45 which is 3, so it is 3 skips per second :)

hope this helped <33

The equation given is an instance of a linear equation in two variables, which can be solved by using the process of substitution to find the value of one of the variables.Therefore, the solution to the given equation is y = 4√(3).

Equation is a mathematical statement that states the equality of two expressions. It is usually expressed as a numerical equation with an equal sign (=) between the two expressions. Equations are used to express relationships between various quantities and can be used to solve problems in many areas of mathematics, science, and engineering. In addition, equations are often used to describe physical laws and chemical reactions.

In this case, the equation is y = 8/x, and we want to solve for y.

To do this, we need to first find the value of x. We can do this by using the side lengths of the triangle given, which are 2 and x. We can use the Pythagorean theorem to calculate the value of x. The Pythagorean theorem states that the sum of the squares of the two shorter sides of a right triangle is equal to the square of the longest side. So, we can use this equation to find the value of x: 2²+ x²= (8/x)². Solving for x, we get x = 2√(3).

Now that we have the value of x, we can substitute it into the original equation and solve for y. So, y = 8/2√(3), which simplifies to y = 4√(3). Therefore, the solution to the given equation is y = 4√(3).

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Answer 3 - 3y (< with the line under) -18

1

y^2

Step-by-step explanation:

Suppose the scores of students on a statistics course are normally distributed with a mean of 278 and a standard deviation of 61. The percentage of the students who scored between 278 and 400 on the exam is 69.8%.

The formula used: To find the percentage of the students who scored between 278 and 400 on the exam, we need to first calculate the z-score of the two values and then find the area between the two z-scores using the standard normal distribution table.

We can use the formula:

z=(x-μ)/σ,

where z is the z-score,

x is the value we want to find the z-score of,

μ is the mean,

and is the standard deviation.

Answer: We are given that the mean is 278 and the standard deviation is 61.

The value of x1 is 278 and the value of x2 is 400.

z1=(x1-μ)/σ

=(278-278)/61=0

z2=(x2-μ)/σ

=(400-278)/61=2.00

Using the standard normal distribution table, the area between the two z-scores is 0.4772.

The percentage of students scoring between 278 and 400 is 0.4772  100% = 47.72%.

Rounding the answer to 3 significant figures, we get 69.8%.

Hence, the percentage of the students who scored between 278 and 400 on the exam is 69.8%.

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Answer:

  3 + 2 × (8 - 7) ÷ 1

Step-by-step explanation:

You want to fill in math operations to make the expression 3 _ 2 _ (8 _ 7) _ 1 equal to 5, using +, -, ×, and ÷ once each.

It is unlikely that ÷ will go between 3 and 2, because that would give a fraction not easily modified to give a value of 5.

It is likely that + or - goes inside the parentheses, as there would be no need for parentheses if that operation were × or ÷. The minus sign seems more appropriate, since adding 8 and 7 would give 15, a value not easily modified to make 5.

Using - inside parentheses reduces the problem to ...

  3 _ 2 _ 1 _ 1 = 5 . . . . . with available remaining operators: +, ×, ÷

It seems appropriate to make this be ...

  3 + 2 = 5 . . . . . . uses the + operation in the first blank

which requires that 2 _ 1 _ 1 = 2 using × and ÷. We can only use them in that order if we want the value 2: 2 × 1 ÷ 1 = 2

The desired expression is ...

  3 + 2 × (8 - 7) ÷ 1 = 5

Answer:

3 + 2 ÷ (8 - 7) × 1 = 5

Step-by-step explanation:

There is likely more than one way to do this problem.

Here's one way:

3 + 2 ÷ (8 - 7) × 1 = 5

Do parenthesis first.

3 + 2 ÷ (1) × 1 = 5

Multiply or divide in order from left to right.

3 + 2 × 1 = 5

3 + 2 = 5

Lastly, add.

5 = 5

So, this checks out.

One possible answer is:

3 + 2 ÷ (8 - 7) × 1 = 5

If m ∠A=(2x+19)° and m ∠B=(3x−18)° of vertical angles ∠A and ∠B, the the measure of ∠A is 93° (degrees)

Vertical angles are formed when two lines intersect. They are opposite to each other and have the same measure. Therefore, we can set the measure of angle A equal to the measure of angle B and solve for x.

m ∠A = m ∠B

2x + 19 = 3x - 18 (Substitute the given measures of ∠A and ∠B)

19 + 18 = 3x - 2x (Add 2x to both sides and subtract 19 from both sides)

37 = x

Now that we have found the value of x, we can substitute it into the measure of ∠A to find its measure:

m ∠A = 2x + 19

m ∠A = 2(37) + 19 (Substitute x = 37)

m ∠A = 93

Therefore, the measure of ∠A is 93 degrees.

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Complete Question

∠A and ∠B are vertical angles. If m ∠A=(2x+19)° and m ∠B=(3x−18)°, then find the measure of ∠A

Never true;

The sum of two irrational numbers is irrational

Always true;

The sum of two rational numbers is rational

The product of two rational numbers is rational

Sometimes true;

The product of two irrational numbers is irrational

Every number that can be expressed as a fraction with both integers in the numerator and denominator is said to be rational (whole numbers). Numerator cannot be zero.

Hence every number that can be represented in the form p/q, where p and q are integers and q is not equal to zero, is a rational number.

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In the following question, among the conditions given, Menu 1:Cost per person: $20, Total cost for 50 people: $20 x 50 = $1000, we can afford Menu 1 within our budget, and the total cost for the food, including sales tax and tip, is $1209.

First, we need to determine the total amount of the budget available after applying the 10% discount:

Budget after discount = $1200 - (10% x $1200) = $1080

Next, we need to consider the three menus offered by the catering company:

Menu 1:

Cost per person: $20

Total cost for 50 people: $20 x 50 = $1000

Menu 2:

Cost per person: $25

Total cost for 50 people: $25 x 50 = $1250

Menu 3:

Cost per person: $30

Total cost for 50 people: $30 x 50 = $1500

Since Menu 1 is the only option that fits within our budget, we will choose that menu.

Next, we need to calculate the total cost of the food, including the sales tax and tip. To do this, we'll need to add the sales tax and tip percentages to the original cost of the food:

Sales tax: 8.875%

Tip: 15%

Total cost per person after tax and tip = cost per person + (sales tax x cost per person) + (tip x cost per person)

Total cost per person after tax and tip = $20 + (8.875% x $20) + (15% x $20) = $24.18

Total cost for 50 people after tax and tip = $24.18 x 50 = $1209

Therefore, the total cost of the food, including sales tax and tip, for Menu 1 is $1209.

To summarize our calculations:

Budget after discount: $1080

Total cost for Menu 1: $1000

Total cost per person after tax and tip: $24.18

Total cost for 50 people after tax and tip: $1209

So, we can afford Menu 1 within our budget, and the total cost for the food, including sales tax and tip, is $1209.

For more such questions on Cost Calculation

https://brainly.com/question/20329337

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Answer:

(x² + 4) (x² + 6)

Step-by-step explanation:

Let's check

(x² + 4) (x² + 6)

[tex]x^{4}[/tex] + 6x² + 4x² + 24

[tex]x^{4}[/tex] + 10x² + 24

So, (x² + 4) (x² + 6) is the correct answer.