Guess how old I am. hints: I'm not really in college, I'm in Middle School. When you find out my age you are in for a shock for I, I am the youngest in my dock. less than 13, higher than 8 once you get it right, it's time to celebrate. P.S (The reason that the category is "Math" is because I am a Mathmagician So don't make this a compotion!)

Answer:

We want the ith row of the new matrix SijA to be the old jth row of A, so we need the ith row of Sij to extract the jth entry of column of A.

This mean the ith row of Sij must have a 1 in the jth entry and 0's everywhere else.

Similarly, the jth row of Sij must have a 1 in the ith entry and 0's everywhere else.

in the piecewise notation this is

(Sij)kl ={1 if k=i and l=j, 1 if k=k and l=i; 1 if k=l but k#i,j, 0 otherwise

Step-by-step explanation:

Answer:

The answer is A.

Answer:

y = 4

Step-by-step explanation:

Given

3x + 7y = 37 ← substitute x = 3 into the equation

3(3) + 7y = 37, that is

9 + 7y = 37 ( subtract 9 from both sides )

7y = 28 ( divide both sides by 7 )

y = 4

Step-by-step explanation:

Answer:

C. 9

Step-by-step explanation:

This is the answer because of how the math works...Its really hard to explain how it works.

Answer:

Lower confidence limit = 20.191

Step-by-step explanation:

Sample mean; x' = 22

Sample standard deviation; s = 5.5

Sample size; n = 50

Confidence interval = 99%

Since sample size > 30, we will use the formula;

CI = x' ± zs/√n

Where;

x' is sample mean

s is sample standard deviation

n is sample size

z is z-value of the confidence interval

From the table attached, z for 99% = 2.3263

Thus;

CI = 22 ± (2.3263 × 5.5)/√50

CI = 22 ± 1.809

CI = 23.809 or 20.191

Lower confidence limit = 20.191

Answer:

20

Step-by-step explanation:

10 + 8 + 2 = 20

Answer:

20 calls before 6 pm

10 + 2 +8 = 20

Step-by-step explanation:

Please find attached herewith the solution of your question.

Answer: 2.8 m

Hope it helps.

If you have any query, feel free to ask.

To maximize profit 14 downhill and 24 cross country should be produced.

Let X represent the number of downhill skis and Y represent the number of cross country skis.

Manufacturing each ski: Downhill 3 hours Cross Country 2.5 hrs

Finishing time per ski: Downhill 0.5 hours Cross Country 0.5 hours

Total manufacturing time taken = (3)x+ (2.5+) y = 3x +2.5y ≤ 102

total finishing time taken = 0.5x+0.5 y ≤ 19

Profit function

Z = 80x + 90y

The objective is to maximize Z

By solving the two equations we get an intersecting point

(x,y) = (14,24)

In the feasible region corner points are (0, 36) (41,0)

So to maximize profit 14 downhill and 24 cross country should be produced.

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Answer:

option c

Step-by-step explanation:

This is the net of square pyramid.

Base of the square pryamid is square and all the other face are triangle.

Given:

Number of tanks of goldfish = 5

Number of fishes in a tank = 40

Step 1: Find the total number of fishes

Hence, the total number of fishes will be = 5 x 40 = 200 fishes

Step 2: Find the percentage of fin rot

Given:

Number of fishes inspected = 5

Number of fin rot =4

Therefore, the percentage of fin rot will be

So, the percentage of fish with fin rot is 80%

Step 3: Estimate the number of goldfishes with fin rot

since 80% of the fishes is estimated to have fin rot

Then

Total estimate of fin rot =

=> 160 fishes

Hence, the estimated number of goldfish in the store that has fin rot = 160

Answer:

Well the absolute value of 7 is 7 and 7+8 would be 15.

Step-by-step explanation:

Answer: 15

Hope this helped :)

Please give brainliest!

The standard error represents the average deviation of the sample means from the true population mean. Rounding this value to four decimal places, the standard error of X¯¯¯ is approximtely 0.6500 mpg.

A smaller standard error indicates that the sample means are more likely to be close to the population mean.To calculate the standard error of X¯¯¯, the mean from a random sample of 25 fill-ups by one driver, we can use the formula:

Standard Error (SE) = σ / sqrt(n),

where σ is the standard deviation and n is the sample size.

In this case, the standard deviation (σ) is given as 3.25 mpg, and the sample size (n) is 25.

Plugging in these values into the formula, we have:

SE = 3.25 / sqrt(25).

Calculating the square root of 25, we get:

SE = 3.25 / 5.

Performing the division, we find:

SE ≈ 0.65.

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The initial investment of the function is 20 dollars.

The rate growth in percentage is 4%.

The investment after 10 years is 29.6 dollars.

The function \(y=20(1.04)^{t}\) represents the value y of a saving account after t years.

Therefore, the initial investment of the function is 20 dollars.

The rate growth in percentage can be calculated as follows;

rate growth in percent = 0.04 × 100

rate growth in percent = 4 %

Let's find the value of the investment after 10 years.

Therefore,

\(y=20(1.04)^{t}\)

t = 10

\(y=20(1.04)^{10}\)

\(y=20(1.48024428492)\)

y = 29.6048856984

Therefore, the investment after 10 years is as follows:

y = 29.6 dollars

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Answer:

f(2)=-2

Step-by-step explanation:

Values of a function from a graph

The graph of a function is usually a drawn line that joins a number of points that correspond to the ordered pairs (x,y), where x is a given value, and y is the value calculated through the rule of the function, usually a formula or equation.

If we want to know the value for a specific value of x, we find the corresponding x-coordinate, draw an imaginary vertical line until we meet the graph. The value of y at that point is the required value of the function.

For example, for x=0 the graph crosses the y-axis at y=2, thus the ordered pair is (0,2), and f(0)=2.

For x=2, the function has a value of y=-2, thus:

f(2)=-2

Answer:

it's c

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

The value of y is 4√3

Similar triangles have the same corresponding angle measures and proportional side lengths. The corresponding angles of similar triangles are congruent or equal.

Also , the ratio of corresponding sides of similar triangles are equal.

There are two triangles that are similar

Therefore;

y /16 = 4/y

y² = 48

y = √48

y = √16 × √ 3

y = 4√3

Therefore, the value of y is 4√3

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Answer:

d i did the thing

Step-by-step explanation:

Answer:

A round pencil is sharpened at both ends the hight of the pencil is 16cm the length of the pencil is 1cm the radius of the two sharpened ends is 16cm 1.2cm

Calculate the volume using the value 22/7. 

Step-by-step explanation:

We have a diagram for chords in a circle.

Given that OE = 25, AB = 40 and CD = 30, we have to find the length of the other segments in the list.

We start with MB, which will be half the length of AB because OE is a perpendicular bisector.

Then:

For OB we can consider that it is a radius, as O is the center and B is a point on the circumference. As the radius is constant in a circle and we know that OE = 25, then OB should also be OB = 25.

Given OB = 25 ad MB = 20, we can use the Pythagorean theorem to find OM as:

Now we calculate ND. As OE is a perpendicular bisector of CD, we have:

The segment OD is a radius so it has a length like OE. Then, OD = 25.

For the segment ON we can use the Pythagorean theorem again:

The last segment is MN which length can be expressed as the difference of the lengths of ON and OM:

Answer:

MB = 20

OB = 25

OM = 15

ND = 15

OD = 25

ON = 20

MN = 5

We have a graph of a line.

We have to find the y-intercept and slope.

The y-intercept can be found at the point of intersection between the line and the vertical axis. Is the value of the line when x = 0.

In this case, the y-intercept is b = 5.

For the slope, we need two points. We have the y-intercept at point (0,5) andthe x-intercept of the line at (5,0).

Then, we can calculate the slope m as:

If we write the equation of the line in slope-intercept form, we get:

We have obtained the same equation that is written in the question.

Answer:

The slope is -1.

The y-intercept is (x,y) = (0,5).

Answer:

8.9° C

Step-by-step explanation:

The formula to convert Fahrenheit degrees to Celsius degrees is:

C = (5/9)(F - 32)

We have F = 48, C = ?

C = (5/9)(48 - 32)

C = (5/9)(16)

C = 8.88888

Answer: 8.9° C

The two solutions to the given initial-value problem are x₁(t) = 0 and x₂(t) = (2/3t)³/² for t > 0. Using the Taylor series method results in a diverging series, as x₄(t) approaches infinity as t approaches 0.

To verify that x₁(t) = 0 is a solution:

x₁'(t) = (0)¹/³ = 0

Therefore, x₁(t) = 0 is a solution.

To verify that x₂(t) = (2/3t)³/² is a solution:

x₂'(t) = [3/2(2/3t)¹/²] * (-2/3t⁻²)

= -[2/3t]¹/² / t²

= -[2/(3t³)]¹/²

Therefore, x₂'(t) = x₂¹/³(t).

Also, x₂(0) = [2/(3*0)]³/² = undefined, so x₂(t) is not a solution to the initial-value problem with x(0) = 0.

Now, let's use the Taylor series method to solve the initial-value problem:

x₀(t) = 0

x₁(t) = x₀(t) + x₀'(t) * (t - 0)

= 0 + 0 * t

= 0

x₂(t) = x₁(t) + [x₁'(t) + (1/2)x₀''(t)] * (t - 0)²

= 0 + [0 + (1/2)(0)] * t²

= 0

x₃(t) = x₂(t) + [x₂'(t) + (1/2)x₁''(t) + (1/6)x₀'''(t)] * (t - 0)³

= 0 + [x₂¹/³(t) + (1/2)(0) + (1/6)(0)] * t³

= [2/(3t³)]¹/²

x₄(t) = x₃(t) + [x₃'(t) + (1/2)x₂''(t) + (1/6)x₁'''(t) + (1/24)x₀''''(t)] * (t - 0)⁴

= [2/(3t³)]¹/² + [-(3/4)[2/(3t³)]⁵/² + (1/2)(0) + (1/6)(0) + (1/24)(0)] * t⁴

= [2/(3t³)]¹/² - (3/4)[2/(3t³)]⁵/² * t⁴

As t approaches 0, x₄(t) approaches infinity. This suggests that the Taylor series method diverges for this initial-value problem.

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It should be noted that the number of sample size based on the information will be 300.

In order to calculate the sample size, we can use the following formula:

n = z² * p * (1-p) / E²

n = 1.96² * 0.5 * (1-0.5) / 0.05²

= 300

A questionnaire is a method of gathering data that makes use of written questions to be answered by the respondents. It is a popular method of data collection because it is relatively easy to administer and can be used to collect a wide variety of information.

In the first column, the population is the entire National Capital Region (NCR). The sample is the city of Manila. In the second column, the population is all STEM students. The sample is all academic track students. In the third column, the population is all the tablespoons of sugar in the jar. The sample is one tablespoon of sugar. In the fourth column, the population is all the vowels in the word "juice". The sample is the vowel "i".

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Answer:-4/5

Step-by-step explanation:

Answer:

5,-17

6,-21

Step-by-step explanation:

When the input goes up by 1 the output goes up by negative 4 each time

Complete Question

Let A be an n x n matrix, b be a nonzero vector, and x_0 be a solution vector of the system Ax = b. Show that x is a solution of the non-homogeneous system Ax = b if and only if y = x - x_0 is a solution of the homogeneous system Ay = 0.

Answer:

Step-by-step explanation:

From the question we are told that

    A is an  n × n matrix

   b is a zero vector

  \(x_o\) us the solution vector of  \(Ax = b\)

Which implies that  

     \(Ax_o = b\)

So first we show that

  if \(x\) is the solution matrix of \(Ax = b\)

  and  \(y= x-x_o\) is the solution of  \(Ay = 0\)

Then

    \(A(x-x_o) = 0\)

=>   \(Ax -Ax_o = 0\)

=>   \(b-b = 0\)

Secondly to show that

   if  \(y= x-x_o\) is the solution of  \(Ay =0\)

  then x is the solution of the non-homogeneous system

    \(Ax = b\)

Now we know that \(y = x-x_o\) is the solution of  \(Ay =0\)

So

     \(Ay = 0\)

=>  \(A(x- x_o) = 0\)

=>   \(Ax - Ax_o = 0\)

=>   \(Ax - b = 0\)

=>    \(Ax = b\)

Thus this has been proved

Answer:

4/3 per minute

Step-by-step explanation:

Answer:

It is the tenths place. 109.7 is greater than 109.6

Answer:

A

Step-by-step explanation:

If it is a scale factor of 2 then to get the sides of rectangle z you would multiply the sides of rectangle y

if The sides are twice the size of rectangles y sides then the area is also twice as big

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