A variable of a population has a mean of μ=300 and a standard deviation of σ=28
a. The sampling distribution of the sample mean for samples of size 49 is approximately normally distributed with mean and standard deviation .
b. For part (a) to be true, what assumption did you make about the distribution of the variable under consideration?
A. Uniform distribution.
B. No assumption was made.
C. Normal distribution.
c. Is the statement in part (a) still true if the sample size is 16 instead of 49? Why or why not?
A. No, the sampling distribution of the sample mean is never normal for sample size less than 30.
B. No. Because the distribution of the variable under consideration is not specified, a sample size of at least 30 is needed for part (a) to be true.
C. Yes, the sampling distribution of the sample mean is always normal.

Answer:

To determine the density of the mixture, we need to first find the total volume of the mixture, which can be calculated by adding the volumes of metal A and metal B.

The volume of metal A can be calculated using the formula:

Volume = Mass / Density

So, the volume of metal A is:

Volume of A = 3.3g / 2.7g/cm³ = 1.2222... cm³ (rounded to four decimal places)

Similarly, the volume of metal B is:

Volume of B = 2.4g / 4.8g/cm³ = 0.5 cm³

The total volume of the mixture is therefore:

Total Volume = Volume of A + Volume of B

= 1.2222... cm³ + 0.5 cm³

= 1.7222... cm³ (rounded to four decimal places)

To find the density of the mixture, we can use the formula:

Density = Mass / Volume

The total mass of the mixture is:

Total Mass = Mass of A + Mass of B

= 3.3g + 2.4g

= 5.7g

So, the density of the mixture is:

Density = Total Mass / Total Volume

= 5.7g / 1.7222... cm³

= 3.3103... g/cm³ (rounded to four decimal places)

Therefore, the density of the mixture is approximately 3.3103 g/cm³

Step-by-step explanation:

Answer: (4x+7)-(x+1) = 4x + 7 - x - 1 = 3x + 6.

Therefore, (4x+7)-(x+1) = 3x + 6.

Step-by-step explanation:

Answer:

Step-by-step explanation:

1. Distribute the Negative sign

(4x +7 ) + (-x - 1)

2. Remove Paranthesis

4x + 7- x - 1

3. Solve

4x - x + 7 - 1

3x + 6

4. (optional) Factor out the 3

3(x+2)

The answer is 3x + 6 or 3(x+2)

Answer:

Step-by-step explanation:

The answer is B because it goes 7,9,9,9,10,12,14,14,16 The number in the middle is the median(10) 4 on each side so second number from the front is your Q1 (9) second number from the back is your Q2 (14) smallest number is 7 and biggest nimber is 14 so that is your min. and max. so your answer is D

The value of the identities is sin O = -2/5. Option D

From the information given, we have that;

sec O = 5/3

Then, we have;

Hypotenuse = 5

adjacent = 5

Note that in the fourth quadrant only cosecant and secant identities are positive unlike in the first quadrant were all the identities are positive, then, we have;

cos O = adjacent/hypotenuse

substitute the values, we have

cos O = -3/5

Substitute the values, we get;

For the sine identity

sin O = -2/5

Hence, the ratio is -2/5 for sine identity

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If comparing means of two groups with equal sample sizes, always use a paired test. The statement is false.

A paired test is used when each observation in one sample is paired with a corresponding observation in the other sample. This pairing can occur naturally (e.g. before and after treatment in a clinical trial) or can be done by matching subjects based on relevant characteristics. Paired tests have greater power to detect differences between groups because they account for the individual variability in the observations and reduce the influence of extraneous factors that affect each observation similarly. However, they are only appropriate when there is a natural pairing or matching of observations. If the samples are independent, meaning that the observations in one sample are not paired with the observations in the other sample, then a paired test is not appropriate. In this case, an independent sample t-test is used to compare the means of the two groups. The sample size does not determine whether a paired test or an independent sample t-test should be used; rather, it depends on the nature of the observations and the research question being investigated.

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Answer:

2a) The standard error is given by:

SE = sqrt[(s1^2/n1) + (s2^2/n2)]

  = sqrt[(5.10^2/16) + (5.23^2/16)]

  = 2.32

2b) The test statistic is given by:

t = (x1 - x2) / SE

 = (45.13 - 48.69) / 2.32

 = -1.53

2c) The p-value for a two-tailed test with alpha = 0.05 and degrees of freedom = 30 (n1 + n2 - 2) is 0.1384.

2d) Since the p-value (0.1384) is greater than the level of significance (0.05), we fail to reject the null hypothesis that there is no difference in the cost of high end red and white wines. Therefore, we cannot conclude that there is a significant difference in the cost of high end wines.

Answer: To determine the probability that there exists a triangle with side lengths x, y, and z, we need to find the probability that the three side lengths satisfy the triangle inequality, which states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Since x, y, and z are independent and uniformly distributed on [0, 1], the probability density function of each variable is f(t) = 1 for 0 ≤ t ≤ 1 and 0 otherwise.

We can use geometric probability to determine the probability that x, y, and z satisfy the triangle inequality. Imagine a cube with side length 1, where the x-axis represents the value of x, the y-axis represents the value of y, and the z-axis represents the value of z. The region of the cube where x + y > z, x + z > y, and y + z > x corresponds to a tetrahedron with vertices at (0, 0, 0), (1, 0, 0), (0, 1, 0), and (0, 0, 1), as shown below:

    (0,1,0)         (1,0,0)

       *---------------*

      /|              /|

     / |             / |

    /  |            /  |

(0,0,1)  *----------/---* (1,0,1)

   |   / (0,0,0)  |   /

   |  /           |  /

   | /            | /

   |/             |/

   *---------------* (0,1,1)

  (0,1,1)        (1,1,0)

The volume of this tetrahedron is 1/6 of the volume of the cube, since each of the four triangular faces has half the area of a face of the cube.

Therefore, the probability that x, y, and z satisfy the triangle inequality (i.e., that there exists a triangle with side lengths x, y, and z) is equal to the volume of this tetrahedron, which is 1/6.

Hence, the probability that there exists a triangle with side lengths x, y, and z is 1/6, or approximately 0.1667.

The probability that there exists a triangle with side lengths x, y, and z is 1/6 or approximately 0.1667.  The probability that there exists a triangle with side lengths x, y, and z can be found by determining the probability that the three sides satisfy the triangle inequality.

This inequality states that the sum of any two sides must be greater than the third side.

Since x, y, and z are chosen uniformly from [0, 1], we can assume that they are continuous random variables with a uniform distribution over the interval [0, 1].

Therefore, the probability that the three sides satisfy the triangle inequality can be found by integrating the joint probability density function of x, y, and z over the region where the triangle inequality holds. This region can be described as the set of all (x, y, z) that satisfy the following three conditions:

1) x + y > z
2) x + z > y
3) y + z > x

To find the probability, we integrate the joint probability density function over this region:

P(triangle exists) = ∫∫∫ R f(x, y, z) dxdydz

where R is the region defined by the three conditions above, and f(x, y, z) is the joint probability density function of x, y, and z, which is 1 over the interval [0, 1] since they are uniformly distributed.

Evaluating this triple integral is a bit tricky, but it turns out that the probability is 1/6. Therefore, the probability that there exists a triangle with side lengths x, y, and z is 1/6, which is approximately 0.1667.

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Answer:

Down

Step-by-step explanation:

The formula you provided is used to calculate the required sample size for a two-tailed test with a confidence level of 95%.

The condition for using this formula is that the sample size is not given and needs to be determined. This formula is not a derivative of any other formula, but rather a standalone equation used in statistics to determine sample size.

In the case where you want to determine the required sample size for a two-tailed test without a given value for 'n', you can use the formula n = (Z(α/2) + Z(β))² * (σ1² + σ2²) / Δ². The condition is a two-tailed test, meaning you are testing for the possibility of a relationship in both directions. This formula is a derivative of the more general sample size calculation for hypothesis testing, adjusted specifically for two-tailed tests. In your example, it appears that some values or symbols may be incorrect, so please double-check the information and let me know if you need further assistance.

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Based on the monthly data on the price of bitcoin, the average monthly growth rate can be calculated by taking the difference in price from the previous month and dividing it by the previous month's price. Using the average monthly growth rate, you can estimate the future value of your $1,000 Bitcoin investment.

Once this is done for each month, the resulting growth rates can be averaged to find the average monthly growth rate. As for the standard deviation of the monthly growth observations, this can be calculated using a statistical software or a calculator that has the capability to perform statistical calculations. Without the actual data, it is not possible to provide an exact answer to the question. However, it is important to note that investing in bitcoin can be volatile and unpredictable, so it is important to do thorough research and understand the potential risks before making any investment decisions. To estimate the average monthly growth rate and standard deviation of your Bitcoin investment, follow these steps:
1. Compile the monthly price data for Bitcoin.
2. Calculate the monthly growth rate for each month by using the formula: (Current Month Price - Previous Month Price) / Previous Month Price.
3. Add up all the monthly growth rates and divide the sum by the number of months in your data sample. This will give you the average monthly growth rate for Bitcoin.
4. To calculate the standard deviation, first find the variance. Subtract the average monthly growth rate from each individual growth rate, square the result, and find the average of these squared differences.
5. Finally, take the square root of the variance to get the standard deviation.

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A confidence interval is a range of values that is likely to contain the true value of an unknown parameter with a certain level of confidence.

We can use the formula for the confidence interval of a proportion:

p±z α/2√p(1− p)/n

where $\hat{p}$ is the sample proportion, $n$ is the sample size, and $z_{\alpha/2}$ is the critical value from the standard normal distribution.

In this case, we have $\hat{p} = \frac{14}{130} = 0.1077$ and $n=130$. Using a table or calculator, we find that $z_{\alpha/2} = 2.33$ for a 98% confidence interval.

Plugging in the values, we get:

0.1077±2.33 √0.1077(1−0.1077)/130

Simplifying, we get:

(0.063,0.153)

So the answer is (A).

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Answer:

Total amount ≈ $115,952.40 (rounded to 2 decimal places)

Step-by-step explanation:

To calculate the total amount Kyle will pay over 30 years, we need to first determine his annual mortgage payment. We can use the mortgage formula to do this:

M = P * r * (1 + r)^n / ((1 + r)^n - 1)

Where:

M = monthly mortgage payment

P = principal loan amount (in this case, $40,000)

r = monthly interest rate (annual interest rate / 12)

n = total number of payments (loan term in years * 12)

In Kyle's case:

P = $40,000

Annual interest rate = 9% = 0.09

r = 0.09 / 12 = 0.0075

Loan term = 30 years

n = 30 * 12 = 360 payments

Plug these values into the formula:

M = 40,000 * 0.0075 * (1 + 0.0075)^360 / ((1 + 0.0075)^360 - 1)

M ≈ $322.09 (rounded to 2 decimal places)

Now that we have the monthly mortgage payment, we can calculate the total amount paid over 30 years:

Total amount = Monthly mortgage payment * number of payments

Total amount = $322.09 * 360

Total amount ≈ $115,952.40 (rounded to 2 decimal places)

So, Kyle will pay approximately $115,952.40 over 30 years for his mortgage.

The probability of drawing a jack of spades on the first draw and a black card on the second draw is 13/1326.

The probability of drawing a jack of spades from a standard deck of playing cards is 1/52 since there is only one jack of spades in the deck of 52 cards.

Once the jack of spades has been drawn, there are 51 cards left in the deck, of which 26 are black (13 clubs and 13 spades) and 25 are red (13 diamonds and 12 hearts).

The probability of drawing a black card as the second card, given that the first card was the jack of spades, is 26/51.

Now the probability of both events occurring, we multiply the probabilities of the individual events:

P(jack of spades and second card is black) = (1/52) x (26/51)

= 13/1326

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The response rate for this survey was 4.2% (1727 completed out of 41,000 invited), rounded to one decimal place. Using the quick method, the estimated margin of error for a random sample of size 1727 is approximately 2.4%. The margin of error is a good measure of the accuracy of the survey's results because the number of non respondents was large, which may have introduced bias into the sample. However, the fact that the sample was randomly selected is a good indication of the survey's accuracy. The fact that only 33% of responding mothers said they communicate at least once a day with their child while at school does not necessarily invalidate the margin of error as a measure of accuracy, as the margin of error is based on the size of the sample, not on the specific results of the survey.

To calculate the response rate, divide the number of completed surveys (1727) by the number of parents invited (41,000) and multiply by 100 to get a percentage.

Response rate = (1727/41,000) * 100
Response rate ≈ 4.2%

To estimate the margin of error, use the quick method formula:

Margin of error ≈ 1 / √(sample size) * 100

Margin of error ≈ 1 / √(1727) * 100
Margin of error ≈ 2.4%

Considering the margin of error, it is not a good measure of the accuracy of the survey's results, because the number of non respondents was large.

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The domain of the function f(x)=−1/2x⁵ is found to be all natural number and the range is all real number using leading coefficient and degree method.

The end behavior of the function f(x) = -(1/2)x⁵ can be determined using the leading coefficient and degree. The leading coefficient is -1/2, which is negative. The degree of the polynomial is 5, which is odd. As a result, we may deduce that the function's final behavior is as follows,

The value of the function f(x) approaches negative infinity as x approaches negative infinity. This indicates that when x travels to the left, the graph of the function declines without bound.

The value of the function f(x) approaches positive infinity as x approaches positive infinity. This indicates that when x travels to the right, the graph of the function grows without bound.

The domain of the function f(x) is all real numbers. Because the function f(x) may take on any feasible value of y, its range is all real numbers.

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The position of the particle at t=1 second is 11 meters.  To find the position of the particle at t = 1 second, we need to integrate the acceleration function to get the velocity function and then integrate the velocity function to get the position function.

a(t) = 20t^3 + 12t^2

Integrating with respect to t:

v(t) = 5t^4 + 4t^3 + C1

Using the initial velocity condition v(0) = 4 m/s:

4 = 0 + 0 + C1

C1 = 4

So, the velocity function is:

v(t) = 5t^4 + 4t^3 + 4

Integrating with respect to t:

s(t) = (5/5)t^5 + (4/4)t^4 + 4t + C2

Using the initial displacement condition s(0) = 5 m:

5 = 0 + 0 + 0 + C2

C2 = 5

So, the position function is:

s(t) = t^5 + t^4 + 4t + 5

Finally, to find the position of the particle at t = 1 second:

s(1) = 1^5 + 1^4 + 4(1) + 5 = 11

Therefore, the position of the particle at t = 1 second is 11 m.

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The value of x in the similar triangle is 12 units. The triangle are similar because they only vary in sizes but have the same shape.

Two triangles are said to be similar if their corresponding angles are congruent and the corresponding sides are in proportion .

The triangles are also similar because they have the same shape but different sizes.

Hence, let's find the value of x as follows:

3 / 9 = 4  / x

cross multiply

3x = 36

divide both sides by 3

x = 36 / 3

x = 12

Therefore, the value of x is 12 units.

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Answer:

The biconditional statement p <-> q is true when p and q have the same truth values and is false otherwise.

Step-by-step explanation:

This is because the biconditional is saying "p if and only if q"

A biconditional statement, written as "p if and only if q" or "p <--> q," is only true when both p and q have the same truth value. In other words, if p is true, then q must also be true for the biconditional statement to be true. Likewise, if p is false, then q must also be false.

Therefore, a biconditional statement is only true when the two statements being compared have equivalent truth values. A biconditional statement, represented as p ↔ q, is only true when both p and q have the same truth values. In other words, it is true when:

1. p is true and q is true, or
2. p is false and q is false.

A biconditional essentially means "p if and only if q." If both statements are true or both statements are false, then the biconditional is true. If one statement is true and the other is false, then the biconditional is false.

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The experimental probability of selecting a card with an A is 1/10

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

Number of times = 30

Number of times A is selected = 3

using the above as a guide, we have the following:

P(A) = A selected/Total

So, we have

P(A) = 3/30

Evaluate

P(A) = 1/10

Hence, the probability is 1/10

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Based on the information given, Ben Brenner should include $16,000 in income on his federal income tax return. This includes the $10,000 awarded in punitive damages, $5,000 in kickbacks on the sale of goods, and $1,000 increase in the value of an asset. The money borrowed from the bank is not considered income for tax purposes.

Based on the given information, Ben Brenner should include the following amounts in his income for his federal income tax return:

1. Jury awarded punitive damages: $10,000
2. Kickbacks on the sale of goods: $5,000

The money borrowed from the bank ($8,000) is not considered income, and the increase in the value of an asset ($1,000) is also not taxable until the asset is sold.

So, the total amount to include in his income for the federal income tax return would be:

$10,000 (punitive damages) + $5,000 (kickbacks) = $15,000

Therefore, the correct answer is option a. $15,000

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The area of the square enclosure is calculated as Area = AB² = 5² = 25 square units.

To find the length of the fourth side of the square, find the distance between points C(7,4) and D(x,y). AB and CD are parallel and perpendicular to each other, so they have the same length. Hence,

AB = CD = √((4-0)² + (0-3)²) = 5

Using this distance to find coordinates at point D:

D(x,y) = A(0,3) + (-5,-5) = (-5,-2)

Now to find the length of each side of the square:

AB = CD = √((4-0)² + (0-3)²) = 5

BC = AD = √((7-4)² + (4-0)²) = 5

Therefore, the area of the square enclosure is:

Area = AB² = 5² = 25 square units.

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Answer:

Horizontal label

Step-by-step explanation:

Horizontal label has numbers going from the bottom to the top from 0 to 100.

The speed of the boat is approximately 9.21 km/h.

In order to ascertain the speed of the boat, we must find out the number of kilometers traversed by it and the amount of time taken for traveling that distance.

The traveled distance by the boat is equal to the space between two points,

or the magnitude of (final position vector - initial position vector),

which in this case is (-7i - 3j). Hence, the total distance of sqrt((-7)^2 + (-3)^2) kilometers is obtained.

Regarding the amount of time taken to travel that predetermined distance, it computes to be 2 hours 45 minutes, or 2.75 hours.

Therefore, through simple division, the speed of the boat can be determined at roughly 9.21 km/h, which results when you divide the traveled distance of sqrt(58) by the time taken in hours, that is, 2.75.

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The point estimator of the mean percentage of airline reservations canceled on the day of the flight is the midpoint of the 95% confidence interval, which is (3% + 9%) / 2 = 6%.

The point estimator of the mean percentage of airline reservations being canceled on the day of the flight is the midpoint of the confidence interval, which is (3% + 9%) / 2 = 6%. Therefore, the point estimator of the mean percentage of reservations that are canceled on the day of the flight is 6%.

This means that based on the data, we can estimate that the mean percentage of airline reservations being canceled on the day of the flight is around 6%. However, since this is a point estimate, there is some uncertainty associated with it. The 95% confidence interval provides a range of values within which we can be 95% confident that the true mean percentage of cancellations falls. In this case, we can be 95% confident that the true mean percentage of cancellations on the day of the flight falls between 3% and 9%.

Overall, the interval and the point estimator provide us with useful information about the mean percentage of airline reservations being canceled on the day of the flight and allow us to make informed decisions and predictions about future cancellations.

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The probability of choosing the first chip a white, then the second chip, not Black is 2/15.

The probability of choosing the first chip a white, then the second chip, not Black is determined as follows:

There are a total of 10 chips, 4 whites, and 6 blacks

The probability of choosing the first chip, a white = 4/10 or 2/5

Then without replacement, there are now 3 white chips and 6 black chips.

The probability of not choosing a black is the probability of picj=king another white chip

Probability of another white chip = 3/9 or 1/3

Therefore;

P(white and not a black) = 4/10 * 1/3

P(white and not a black) = 4/30

P(white and not a black) = 2/15

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Complete question:

Suppose a bag contains 4 white chips and 6 black chips. You randomly choose one of the chips. Without replacing the first chip, you choose a second chip. Find the probability of choosing the first chip a white, then the second chip, not a Black.

4/45

1/10

2/25

1/9

Answer:

Step-by-step explanation:

C:  (-4, 3)

r = √16 = 4

D:  [-8, 0]     -8<x<0

R: [-1, 7]     -1<y<7

The given equation is in standard form, so you can get the (h,k) values right from the equation.

To get the Domain and Range, it's easiest to graph the circle (use an online graphing calculator like Desmos), then see that x goes from -8 to 0, and y goes from -1 to 7.

Answer:

undetermined

you need more info, what does x equal?
This is only true if x=0

Answer:

Perpendicular

Given the following vectors:

[tex]\vec u =-5 \hat i +8 \hat j\\\vec v =56 \hat i +35 \hat j\\[/tex]

We are asked to determine whether vectors u and v are parallel or perpendicular.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

How do we do this?

To determine whether two vectors are parallel, the result of their cross product is zero.

To determine whether two vectors are perpendicular, the result of their dot product is zero.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[tex]\bold{Given \ two \ vectors...}\\\vec a=a_x \hat i + a_y \hat j +a_z \hat k\\\\\vec b=b_x \hat i + b_y \hat j +b_z \hat k\\[/tex]

[tex]\bold{Cross \ Product} \Rightarrow \vec a \times \vec b= \begin{vmatrix}\hat i & \hat j & \hat k\\a_x & a_y & a_z\\b_x & b_y & b_z\end{vmatrix} \rightarrow \begin{vmatrix}a_y & a_z \\b_y & b_z \end{vmatrix} \hat i- \begin{vmatrix}a_x & a_z \\b_x & b_z \end{vmatrix} \hat j+\begin{vmatrix}a_x & a_y \\b_x & b_y \end{vmatrix} \hat k[/tex]

[tex]\bold{Dot \ Product} \Rightarrow \vec a \cdot \vec b = a_xb_x+a_yb_y+a_zb_z[/tex]

Note: The result of the cross product is a vector while the result of a dot product is a scalar.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cross product:

[tex]\vec u \times \vec v = \begin{vmatrix}\hat i & \hat j & \hat k\\-5 & 8 & 0\\56 & 35 & 0\end{vmatrix}[/tex]

[tex]\Longrightarrow \begin{vmatrix} 8 & 0 \\ 35 & 0 \end{vmatrix} \hat i- \begin{vmatrix}-5 & 0 \\56 & 0 \end{vmatrix} \hat j+\begin{vmatrix}-5 & 8 \\56 & 35 \end{vmatrix} \hat k[/tex]

[tex]\Longrightarrow [(8)(0)-(0)(35)]\hat i -[(-5)(0)-(0)(56)]\hat j +[(-5)(35)-(8)(56)] \hat k[/tex]

[tex]\Longrightarrow (0)\hat i (0)\hat j +[-175-448] \hat k[/tex]

[tex]\Longrightarrow (0)\hat i (0)\hat j +(-623) \hat k[/tex]

[tex]Thus, \ \boxed{\vec u \times \vec v = 0\hat i + 0\hat j -623 \hat k}[/tex]

Which does not equal zero. So, these vectors aren't parallel.

Now, dot product:

[tex]\vec u \cdot \vec v = (-5)(56)+(8)(35)+(0)(0)[/tex]

[tex]\Longrightarrow \vec u \cdot \vec v = -280+280+0[/tex]

[tex]Thus, \ \boxed{ \vec u \cdot \vec v = 0}[/tex]

The dot product of vectors u and v equals zero. These vectors are perpendicular!

In addition to telling us at what percentile a given score (or mean) falls, Z scores tell us (B) how extreme the difference is.

Z scores are a standardized measure of how far a data point or sample mean deviates from the population mean in standard deviation units. In addition to telling us at what percentile a given score or mean falls, Z scores also tell us how extreme the difference is. A high positive or negative Z score indicates that the data point or sample mean is far from the population mean, while a low Z score indicates that the data point or sample mean is close to the population mean.

However, Z scores do not tell us whether our results are due to chance or not. To determine whether our results are significant, we need to calculate a p-value, which tells us the probability of obtaining a sample as extreme as ours by chance alone. If the p-value is below a predetermined threshold (usually 0.05), we can conclude that our results are statistically significant and not just due to chance.

Therefore, the correct answer is B: Z scores tell us how extreme the difference is, but they do not provide evidence for or against the hypothesis that our results are due to chance or that our data is different from a population. Additional statistical tests are needed to make such conclusions.

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if equation 6 × ∎ = 420 then the value of ∎ is 70.

Given that 6 × ∎ = 420

We have to find the value ∎

Let us consider ∎  as x

6×x=420

To find the value of x we have to divide both sides by 6

x=420/6

x=70

Hence, if 6 × ∎ = 420 then the value of ∎ is 70.

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