I need help fixing this​

Answer:

the last option

Step-by-step explanation:

The first choice would only target certain customers who come at a very specific time.

the second choice only surveys customers who spend over ten dollars.

The third only surveys muffin eaters!

The last choice has the most unbiased and random sampling to get a sample of all customers.

The ion product of water is defined as the product of the concentrations of hydronium. At 10 °C, the ion product of water (Kw) is 2.93 x 10^-15.  So, the concentration of hydronium ions at 10 °C is approximately 1.71 * 10^-8 M, written with three significant figures and in scientific notation.

At 10 °C, the ion product of water (Kw) is 2.93 x 10^-15. The ion product of water is defined as the product of the concentrations of hydronium

([tex]H_{3}O+[/tex]) and hydroxide ([tex]OH-[/tex]) ions in pure water at a given temperature. Since water is neutral, the concentrations of  [tex]H_{3}O+[/tex]and [tex]OH-[/tex]are equal, so the concentration of each ion can be found by taking the square root of the ion product.
[tex]c (H_{3}0) = c(OH-) = \sqrt{(Kw)} = \sqrt{(2.93 x 10^-15)} = 1.71 x 10^-8 mol/L[/tex]
Therefore, the concentration of hydronium ions at 10 °C is 1.71 x 10^-8 mol/L. This answer has three significant figures and is written in scientific notation using the multiplication symbol.
To find the concentration of hydronium ions, we'll use the ion product of water (Kw) formula:
Kw = [H+] * [OH-]
We are given the Kw value at 10 °C, which is 2.93 * 10^-15. Since the concentration of hydronium ions [H+] and hydroxide ions [OH-] are equal in pure water, we can rewrite the equation as:
Kw = [H+]^2
Now, we need to find [H+]:
1. Divide both sides of the equation by [H+].
  [H+] = √(Kw)
2. Substitute the given Kw value.
  [H+] = √(2.93 * 10^-15)
3. Calculate the square root of Kw.
  [H+] ≈ 1.71 * 10^-8
So, the concentration of hydronium ions at 10 °C is approximately

1.71 * 10^-8 M, written with three significant figures and in scientific notation.

Learn more about hydronium ions here:

https://brainly.com/question/14619642

#SPJ11

In the diagram below, the expression in each circle is the result of the sum of the two rectangles connected to it. The blanks an be filled with 6x + 2y, 3x + y and 5x.

A mathematical equation comprises a formula that uses the equals sign to represent the sameness of two expressions. The meanings of the word equation or its cognates in various languages can vary slightly. For instance, in French, an equation is defined as having any number of variables, whereas in English, an equation is any well-formed formula that consists of two expressions linked by the equals sign.

The circle by your left:

(4x + 3y) + (2x - y)

Distribute +1

4x + 3y + 2x - y

Add like terms together

6x + 2y

The rectangle by at the bottom right:

(4x + 5y) - (x + 4y)

Distribute -1

4x + 5y - x - 4y

Group like terms

4x - x + 5y - 4y

3x + y

The circle at the bottom middle:

(2x - y) + (3x + y)

Distribute +1

2x - y + 3x + y

Group like terms

2x + 3x - y + y

5x

To know more about mathematical equation, here:

https://brainly.com/question/28980347

#SPJ1

The surface area of the two rectangular prisms is S = 2 ( 2B + ph )

Given data ,

Surface Area of the prism = 2B + ph

The area of the triangular prism is A = ph + ( 1/2 ) bh

Now , ice cube is cut horizontally into two smaller rectangles prisms

where the length of the prism is l and width is w , and height is h

On simplifying , we get

The surface area of 2 prisms is S = 2 ( 2B + ph )

where B = base area of prism = l x w

And , p = perimeter of prism

h = height of prism

Hence , the surface area is S = 2 ( 2B + ph )

To learn more about surface area of prism click :

https://brainly.com/question/9183590

#SPJ1

Answer:

approximately $147.60 in 5.5 hours

Step-by-step explanation:

To find how much Alexa makes in 5.5 hours, we can use linear interpolation. Linear interpolation is a method of estimating a value between two known values based on the assumption that the value changes linearly between them.

We can use the first two data points to calculate the hourly rate:

Hourly rate = (Earnings at 16 hours - Earnings at 8 hours) / (16 - 8) = ($427.20 - $213.60) / 8 = $26.40 per hour

Then we can use this hourly rate to estimate the earnings for 5.5 hours:

Earnings at 5.5 hours = Earnings at 8 hours + (5.5 - 8) x Hourly rate

Earnings at 5.5 hours = $213.60 + (-2.5) x $26.40

Earnings at 5.5 hours = $213.60 - $66.00

Earnings at 5.5 hours = $147.60

Therefore, Alexa would make approximately $147.60 in 5.5 hours.

Answer:

112 square units

Step-by-step explanation:

the semicircle removed is added on the the other end. so it is the same area as if the semicircle was not removed, ie a rectangle.

area = 8 X 14 = 112 square units

The general solution to the trigonometric equation -√3 secθ = 2 is

θ = 5π/6 + 2πn, where n is an integer.

Use the concept of trigonometric identity defined as:

Trigonometric Identities are equality statements that hold true for all values of the variables in the equation and that use trigonometry functions.

There are several distinctive trigonometric identities that relate a triangle's side length and angle. Only the right-angle triangle is consistent with the trigonometric identities.

The given trigonometric expression is:

-√3 secθ = 2

Divide both sides of the equation by -√3:

secθ = -2/√3.

Since sec is the reciprocal of cosine,

Rewrite the equation as:

cosθ = -√3/2.

The cosine function is negative in the second and third quadrants.

In the unit circle,

The angle whose cosine is -√3/2 is 5π/6 radians or 150 degrees.

To find the general solution,

Consider all angles that are coterminal with 5π/6 radians or 150 degrees.

The general solution is given by:

θ = 5π/6 + 2πn, where n is an integer.

Hence,

The general solution to the trigonometric equation -√3 secθ = 2 is θ = 5π/6 + 2πn, where n is an integer.

To learn more about trigonometric ratios visit:

https://brainly.com/question/29156330

#SPJ12

The complete question is:

What is the general solution to the trigonometric equation -√3 secθ = 2?

False. If the means of two groups are the same, it does not necessarily mean that the underlying distributions of the two groups are the same.

The statement is false. While the means of two groups provide information about the central tendency of the data, they do not provide a complete description of the underlying distributions. Two groups can have the same mean but exhibit different distributions in terms of shape, spread, or other characteristics.

For example, consider two groups: Group A and Group B. Group A has a normal distribution centered around the mean, while Group B has a bimodal distribution with two distinct peaks. Despite having the same mean, the distributions of Group A and Group B are fundamentally different.

The mean only represents the average value and does not capture the full picture of the data. Other statistical measures such as variance, skewness, and kurtosis provide information about the shape, spread, and symmetry of the distributions, respectively. To determine if the underlying distributions of two groups are the same, additional analyses such as hypothesis testing or graphical comparisons are necessary. Therefore, having the same means does not guarantee that the underlying distributions of the two groups are the same.

Visit here to learn more about bimodal distribution :

brainly.com/question/12503475

#SPJ11

The statement "rxy = 0" represents the null hypothesis in correlation analysis, indicating no linear relationship between variables x and y.

In correlation analysis, the correlation coefficient (r) measures the strength and direction of the linear relationship between two variables, usually denoted as x and y. When the statement "rxy = 0" is made, it refers to the null hypothesis in correlation testing. The null hypothesis states that there is no significant correlation between the variables.

If the correlation coefficient (r) between x and y is found to be exactly 0, it suggests that there is no linear relationship between the variables. This means that changes in x are not associated with any predictable changes in y.

Researchers use statistical tests, such as hypothesis testing, to evaluate whether the observed correlation coefficient is significantly different from 0. If the calculated correlation coefficient is significantly different from 0, the null hypothesis is rejected, indicating evidence of a linear relationship between x and y. However, if the calculated correlation coefficient is close to 0, it supports the null hypothesis, suggesting no linear relationship between the variables.


Learn more about Correlation click here :brainly.com/question/28091015

#SPJ11

Option D is correct, at an angle of 25 degrees the target platform attached to the frame.

In the diagram we have to find the angle θ.

At which angle the target platform attached to the frame.

To find the angle we can use the tan function.

We know that tan function is a ratio of opposite side and adjacent side.

The opposite side of angle is 33 in and adjacent side is 72 in.

Tanθ = 33/72

Tanθ = 0.45

Apply tan⁻¹ on both sides of the equation.

θ = tan⁻¹(0.45)

θ =24.56

θ =25 degrees

Hence, at an angle of 25 degrees the target platform attached to the frame.

To learn more on Angles click:

https://brainly.com/question/28451077

#SPJ1

The logarithmic form of the equation 13 to the power of 0 equals 1 is log base 13 of 1 equals 0.

To understand why this is the case, recall that the logarithm of a number is the exponent to which another fixed value, called the base, must be raised to produce that number. In this case, the base is 13 and the number is 1. We want to find the exponent to which 13 must be raised to produce 1. Since any number to the power of 0 is equal to 1, we know that 13 to the power of 0 equals 1. Therefore, the logarithm of 1 to the base 13 is 0. Written in logarithmic form, this is log base 13 of 1 equals 0.

Learn more about Exponents here:  brainly.com/question/5497425

#SPJ11

Answer:

Step-by-step explanation:

Answer: 0.6

Any other answer would be too far away

If it takes 5 seconds to travel and you hear it in 3, then 3/5 equals 0.6

Answer:

0.6 miles

Step-by-step explanation:

5 sec is to 1 mile as 3 sec is to x miles

5/1 = 3/x

5x = 3

x = 3/5 = 0.6

Answer: 0.6 miles

The volume of the solid is 80 cubic units.

The given double integral is:

∫ ∫ r 2 x d a

where r = { ( x , y ) ∣ 0 ≤ x ≤ 4 , 0 ≤ y ≤ 5 }

We can identify the integrand 2x as the area of a rectangular strip of thickness dx along the x-axis, with width 2x and height y, located at a distance x from the y-axis. Therefore, the double integral represents the volume of the solid obtained by stacking such rectangular strips over the region r.

To find the volume, we integrate the area of each rectangular strip over the interval 0 ≤ y ≤ 5 and then sum up the volumes of all such strips over the interval 0 ≤ x ≤ 4. Hence, we have:

∫ ∫ r 2 x d a = ∫ 0 4 ∫ 0 5 2x dy d

= ∫ 0 4 [2x(y)|0⁵] dx

= ∫ 0 4 10x dx

= [5x²|0⁴]

= 80

Therefore, the volume of the solid is 80 cubic units.

Learn more about double integral

brainly.com/question/30217024

#SPJ11

The length of the arc of the curve y=lnx over the interval [1,5] is approximately 43.85 units long.

To find the length of the arc of the curve y=lnx over the interval [1,5], we need to use the arc length formula:

L = [tex]\int_1^5[/tex] √(1+(dy/dx)²) dx

We can find dy/dx by taking the derivative of y=lnx:

y' = 1/x

Then, we can substitute into the formula:

L = [tex]\int_1^5[/tex] √(1+(1/x)²) dx

Using substitution, let x = eⁿ, so dx = eⁿ dt:

L = [tex]\int_1^{ln5}[/tex] √(1+e²ⁿ) eⁿ dt

We can use u-substitution with u=1+e²ⁿ, so du/dt=2e²ⁿ:

L = (1/2)  [tex]\int_1^{26}[/tex] √(u) du

L = (1/2) * (2/3) * ([tex]26^\frac{3}{2}[/tex] - 1)

L = 43.85

Therefore, the length of the arc of the curve y=lnx over the interval [1,5] is approximately 43.85 units long.

Learn more about Length of arc here

https://brainly.com/question/31031267

#SPJ4

(a) It will take Marti 38 spins to win by placing a $1 bet on number 15.

(b) The standard deviation of 37.36 means that there's a considerable variation in the number of spins it might take Marti to win her $1 bet on number 15.

We'll be discussing the mean and standard deviation of Y, where Y is the number of spins it takes for Marti to win by betting $1 on number 15 in roulette.

(a) The mean of Y can be calculated using the expected value formula for a geometric distribution: E(Y) = 1/p, where p is the probability of success. In this case, p = 1/38. Therefore, the mean of Y is:
E(Y) = 1 / (1/38) = 38
This means that on average, it will take Marti 38 spins to win by placing a $1 bet on number 15.

(b) The standard deviation of Y can be calculated using the formula for the standard deviation of a geometric distribution: SD(Y) = √[(1-p)/p^2].

Plugging in our values, we get:
SD(Y) = √[(1 - 1/38) / (1/38)^2] ≈ 37.36

The standard deviation of Y, approximately 37.36, indicates the average variation in the number of spins it takes for Marti to win. A higher standard deviation would suggest a wider range of spins needed to win, while a lower standard deviation indicates a more consistent number of spins.

Know more about the geometric distribution

https://brainly.com/question/30360260

#SPJ11

Using the substitution method and the given information, we can evaluate ∫50f(5x)dx as 4.

We can use the substitution method to evaluate the integral ∫50f(5x)dx. Let u = 5x, then du/dx = 5 and dx = du/5. Substituting these expressions into the integral, we get:

∫50f(5x)dx = ∫10f(u) du/5

Next, we can apply the constant multiple rule for integrals, which states that ∫a kf(x)dx = k ∫a f(x)dx for any constant k. Using this rule, we can move the constant factor 1/5 outside the integral:

∫50f(5x)dx = (1/5) ∫10f(u) du

Now, we can use the given information that ∫250f(x)dx = 20 to find a relationship between ∫10f(u) du and ∫250f(x)dx. Substituting u = 5x into the bounds of integration, we get:

∫50f(5x)dx = (1/5) ∫250f(u) du, evaluated from u = 50 to u = 250

Using the Fundamental Theorem of Calculus, we can evaluate the definite integral ∫250f(u) du as follows:

∫250f(u) du = F(250) - F(50)

where F(x) is an antiderivative of f(x). Since f(x) is continuous, it has an antiderivative F(x). We are given that ∫250f(x)dx = 20, so we can write:

F(250) - F(50) = ∫250f(x)dx = 20

Simplifying, we get:

F(250) = F(50) + 20

Now we can substitute this relationship back into our expression for ∫50f(5x)dx:

∫50f(5x)dx = (1/5) ∫250f(u) du, evaluated from u = 50 to u = 250
              = (1/5) [F(250) - F(50)]
              = (1/5) [F(50) + 20 - F(50)]
              = 4

Therefore, we have found that:

∫50f(5x)dx = 4

Visit to know more about Substitution method:-

brainly.com/question/22340165

#SPJ11

After considering all the given data we conclude that the three primary trigonometric ratios as a fraction for the mentioned angle are sin A = 9/41, cos A = 40/41, and tan A = 9/40.

Let us proceed by first considering that for the given   right angled triangle ABC,

Here,

AB = 41,

AC = 40,

BC = 9,

we could  evaluate the three primary trigonometric ratios as

Sine (sin) of angle A = Opposite side / Hypotenuse = BC / AB = 9 / 41

Cosine (cos) of angle A = Adjacent side / Hypotenuse = AC / AB = 40 / 41

Tangent (tan) of angle A = Opposite side / Adjacent side = BC / AC = 9 / 40

Hence, sin A = 9/41, cos A = 40/41, and tan A = 9/40.

To learn more about trigonometric ratios

https://brainly.com/question/17155803

#SPJ1

To find the indefinite integral of sec(t)(3sec(t)7tan(t))dt, we can start by using the substitution u = sec(t) + tan(t). Then, du/dt = sec(t)tan(t) + sec^2(t), which simplifies to du/dt = u(tan(t) + 1). We can rearrange this equation to get dt = du/u(tan(t) + 1), which allows us to rewrite the original integral as ∫(3u-21)/u^2du. Simplifying this expression, we get 3ln|u| - 21/u + c.

Substituting back in for u and simplifying, our final answer is 3ln|sec(t) + tan(t)| - 21/(sec(t) + tan(t)) + c.


1. Rewrite the integral: ∫(3 sec^2(t) + 7 sec(t)tan(t)) dt.
2. Integrate each term separately:
  a) ∫3 sec^2(t) dt: Since the integral of sec^2(t) is tan(t), we have 3∫sec^2(t) dt = 3tan(t) + C1.
  b) ∫7 sec(t)tan(t) dt: We use substitution method. Let u = sec(t), then du = sec(t)tan(t) dt. So, the integral becomes 7∫u du = (7/2)u^2 + C2 = (7/2)sec^2(t) + C2.
3. Combine both results: 3tan(t) + (7/2)sec^2(t) + C, where C = C1 + C2 is the constant of integration.

So, the general indefinite integral of the given function is 3tan(t) + (7/2)sec^2(t) + C.

Learn more about constant here : brainly.com/question/31730278

#SPJ11

Answer:x=4

Step-by-step explanation: subtract the 3x from its self then do it to the 5x and then you cross out the 3x's because the cancel out and then your left with 2x-2=6, then you add the 2 to itself which means they cancel out then you add it to the 6 and that gives you 8 then you are left with 2x=8 now you divide the 2x by its self then the 2 cancels out and then 8 divide by 2 is 4 and then x=4

N(5*-26 + *3*)^

que 5* meno 26 + 3 no se puede resolver

Answer:

[tex] \frac{ {6}^{2} }{ {15}^{2} } = \frac{36}{225} = .16 = 16\%[/tex]

The side which must have the same length as BC is RS.

The correct answer choice is option C.

Given the figure ABCD with a similar figure QRST

If AD = 12 and QT = 12

AB = 8 and QR = 8

Then,

BC = RS

and

CD = ST

Hence, the side corresponding to BC is RS

Read more on length:

https://brainly.com/question/30295372

#SPJ1

Answer:

B

Step-by-step explanation:

If you calculated a 95% confidence interval instead of a 99% confidence interval, the width of the interval would typically decrease.

A confidence interval represents a range of values within which we have a certain level of confidence (expressed as a percentage) that the true population parameter lies. The higher the confidence level, the wider the interval because we want to be more confident in capturing the true parameter.

When you calculate a 99% confidence interval, you allow for a larger range of values, which means the interval will be wider. This wider interval provides a higher level of confidence that the true parameter falls within it.

On the other hand, a 95% confidence interval allows for a smaller range of values, resulting in a narrower interval. This narrower interval provides a slightly lower level of confidence compared to the 99% interval.

To know more about confidence interval,

https://brainly.com/question/28566246

#SPJ11

6 × 3,725 is equivalent to the value of 22,350.

We have,

To find the value of 6 × 3,725, we multiply the number 6 by the number 3,725.

This can be done by adding 3,725 to itself 6 times or by adding 6 to itself 3,725 times.

However, it is more efficient to use the multiplication operation, which is a shorthand way of adding a number to itself multiple times.

Using the multiplication operation, we can write 6 × 3,725 as:

6 × 3,725 = 6 × (3,000 + 700 + 20 + 5)

= (6 × 3,000) + (6 × 700) + (6 × 20) + (6 × 5)

= 18,000 + 4,200 + 120 + 30

= 22,350

Therefore,

6 × 3,725 is equivalent to the value of 22,350.

Learn more about expressions here:

https://brainly.com/question/3118662

#SPJ1

Here are two different equations you can use to solve for side m in right triangle MNI:

Pythagorean Theorem:

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum.

The equation is:

[tex]m^2 = MN^2 + NI^2[/tex]

Trigonometric Function (Sine or Cosine):

If you have information about the angles in the triangle, you can use trigonometric functions to find the length of side m.

In this equation, m represents the length of side m, MN represents the length of side MN, and NI represents the length of side NI.

The two equations:

m = MN / sin(I) (using the sine function)

m = MN / cos(M) (using the cosine function)

Here are two different equations you can use to solve for side m in right triangle MNI:

Pythagorean Theorem:

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In this case, side m is the hypotenuse. The equation is:

[tex]m^2 = MN^2 + NI^2[/tex]

Trigonometric Function (Sine or Cosine):

If you have information about the angles in the triangle, you can use trigonometric functions to find the length of side m. For example, if you know the length of side MN and one of the acute angles in the triangle (angle M or angle N), you can use the sine or cosine function. Here are the two equations:

m = MN / sin(I) (using the sine function)

m = MN / cos(M) (using the cosine function)

In these equations, m represents the length of side m, MN represents the length of side MN, and I and M represent the measures of the respective angles in the triangle.

To solve for side m, you need to have at least two known values among the side lengths and angle measures. Once you have these values, substitute them into the appropriate equation and solve for m using basic algebraic operations. Ensure that your calculator is set to the appropriate angle mode (degrees or radians) when using trigonometric functions.

For more such information on: Pythagorean Theorem

https://brainly.com/question/343682

#SPJ11

Answer:

n = 16

Step-by-step explanation:

LO is parallel to MN since they both make a right angle with KM.

Therefore, triangles KLO and KMN are similar triangles.

As corresponding sides of similar triangles are always in the same ratio:

KL : KM = LO : MN

From inspection of the given diagram:

Substitute the values into the ratio and solve for n:

[tex]\implies \sf KL : KM = LO : MN[/tex]

[tex]\implies \sf 30: 45= n: 24[/tex]

[tex]\implies \sf \dfrac{30}{45}=\dfrac{n}{24}[/tex]

[tex]\implies \sf n=24 \cdot \dfrac{30}{45}[/tex]

[tex]\implies \sf n=\dfrac{720}{45}[/tex]

[tex]\implies \sf n=16[/tex]

Therefore, the value of n is 16.

The sampling method described in which the population is first divided into groups and then random samples are drawn from each group is called stratified sampling. In this sampling method, the population is divided into homogeneous subgroups called strata, based on some characteristic of interest such as age, gender, income level, or geographic location. Random samples are then drawn from each stratum, and the data collected from each sample are combined to form the final sample.

Stratified sampling is often used when the population is heterogeneous, meaning that it has distinct subgroups with different characteristics that may affect the outcome of the study. By dividing the population into homogeneous subgroups, stratified sampling increases the precision of the estimates and reduces the sampling error, compared to simple random sampling. Stratified sampling also ensures that each subgroup of the population is represented in the sample, which may be important for making inferences about the entire population. However, stratified sampling can be more complex and time-consuming than simple random sampling, especially if the population has many subgroups.

To learn more about population  :

brainly.com/question/15889243

#SPJ11

Answer: 19/23

Step-by-step explanation: 4/1=4 16/11=1 5/11 8/7=1 1/7 leaving 19/23 as the only fraction less than one.