HELPPPPPPPPPP Add & subtract matrices .....

PLZ GIVE THE ANSWER .. THANKSSSSS .

andy has 40

david has 60

tim has 80

Answer:

Step-by-step explanation:

Alright, lets get started.

Let Andy have A stamps.

Let David have D stamps.

Let Tim have T stamps.

Andy, David and Tim altogether have 180 stamps, means

[tex]A+D+T=180....................... equation 1[/tex]

Andy has 20 fewer than David, means

[tex]A+20=D...............................equation 2[/tex]

Tim has 80% of the sum of Andy's and David's stamps, means

[tex](A+D)*0.8=T........................equation 3[/tex]

Putting the value of D as A+20 in equation 1 and 3

[tex]A+A+20+T=180[/tex]

[tex]2A+T=160[/tex]........................equation 5

[tex](A+A+20)0.8=T[/tex]

[tex](2A+20)0.8=T[/tex]

[tex]1.6A+16=T[/tex] .......   equation 6

Plugging the value of T in equation 5

[tex]2A+1.6A+16=160[/tex]

[tex]3.6A=144[/tex]

[tex]A=40[/tex]

[tex]D = 40+20 = 60[/tex]

[tex]T=1.6*40+16[/tex]

[tex]T=64+16=80[/tex]

It means Andy has 40 stamps.

It means David has 60 stamps.

It means Tim has 80 stamps.

Hope it will help :)

The answer is 243 27×9 is 243 and area is length times width

ANSWER

243 square feet.

EXPLANATION

The rectangular flower bed has length,

l=27 ft

and width, w=9ft.

The area of a rectangle is

Area=length x width

Since the flower bed is rectangular, we use this formula to find its area.

[tex]Area = 27 \times 9 = 243 {ft}^{2} [/tex]

Therefore the area of the flower bed is 243 square feet.

Answer:

b

Step-by-step explanation:

Given K is the midpoint of JL, then

JK = KL ← substitute values

6x = 3x + 3 ( subtract 3x from both sides )

3x = 3 ( divide both sides by 3 )

x = 1

Hence

JK = 6x = 6 × 1 = 6

KL = 3x + 3 = (3 × 1) + 3 = 3 + 3 = 6

JL = 6 + 6 = 12

Answer:

a is 800

b is 13

c is 61.5

Step-by-step explanation:

for a you add all of the given data together

b you count how many data points there are

c you get the answer from the a  and divided by 13

By adding all of Jill's quiz scores (totaling 800) and dividing by the number of quizzes (13), we find that Jill's average score is approximately 61.54.

To determine the mean score for Jill's quizzes, we will follow these steps:

Total the quiz scores: Add all individual scores together.

Count the number of quizzes: Determine how many quizzes Jill took.

Calculate the average score: Divide the total score by the number of quizzes.

A. Total of Quiz Scores

20 + 40 + 40 + 40 + 60 + 60 + 60 + 60 + 80 + 80 + 80 + 80 + 100 = 800

B. Number of Quizzes

Jill took 13 quizzes.

C. Average Score

The mean score is calculated by dividing the total score by the number of quizzes:

Mean Score = Total Score / Number of Quizzes = 800 / 13 ≈ 61.54

Answer:

About 68 or 68.03

Step-by-step explanation:

Answer:

it is 68.0388555 Kg when you convert it to Kg.

Step-by-step explanation:

1 pound is 0.45359237 Kg

Answer:

$135.70

Step-by-step explanation:

First step is to calculate the daily consumption for this family of four.  We'll assume they're all in age to use and flush the toilet themselves (no babies).

So, one person flushes 9.1 gallons a day, a family of 4 would then flush 4 times that:

daily family flushes = 9.1 gal/person * 4 persons/family = 36.4 gal/family

That's for one day... now for a year...

yearly = 36.4 gal/day * 365 days/yr = 13 286 gal/year

Let's convert those gallons into cubic feet:

13 286 gal / 7.48 gal/ft³ = 1,776.2 ft³

Then we multiply the gallons by the price for 100 cubic feet and divide by 100:

1,776.2  ft³ * $7.64 /100 ft³ = $135.70

Answer:

4 x^(3/2)         + 5x -32

Step-by-step explanation:

This problem involves definite integration (anti-derivatives).

If dy/dx = 6x^(1/2) - 5, then dy = 6x^(1/2)dx - 5dx.

                                        (1/2) + 1

This integrates to y = 6x                        

                                   ----------------                      

                                      (1/2) + 1             x^(3/2)

                                                      =  6 ------------ + C

                                                                 3/2

or:        4 x^(3/2) + C

and the ∫5dx term integrates to 5x + C.

The overall integral is:  

4 x^(3/2) + C + 5x + C. better expressed with just one C:

4 x^(3/2)         + 5x + C

We are told that the curve represented by  this function goes thru (4, 20).

This means that when x = 4, y = 20, and this info enables us to find the value of the constant of integration C:

20 = 4 · 4^(3/2)         + 5·4 + C, or:

20  =  4  (8)           + 20 + C

Then 0 = 32 + C, and so C = -32.

The equation of the curve is thus   4 x^(3/2)         + 5x -32

                                      (1/2 + 1)

The equation of the curve is [tex]y=6x^2-5x+7$.[/tex]

From the given information, we know that the gradient of the curve is [tex]$dy/dx=6x-5[/tex]

This means that the equation of the curve is of the form [tex]$y=6x^2-5x+C$[/tex]  for some constant C.

We can find the value of C by substituting the point (4,20) into the equation of the curve.

This gives us [tex]20=6\cdot4^2-5\cdot4+C[/tex]  so C=7.

Therefore, the equation of the curve is [tex]y=6x^2-5x+7$.[/tex]  

For similar question on equation.

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Answer:

A cube or a cuboid.

Step-by-step explanation:

A cube or a cuboid is a three dimensional shape that has

12 edges, 8 corners or vertices, and 6 faces.

The difference between a cube and cuboid is that a cube has all edges equal which makes every face a square while a cuboid has two square faces and four rectangular faces.

Answer:

10 and 8

Step-by-step explanation:

consecutive even numbers have a difference of 2 between them.

let the width be n then the length is n + 2

Area = n(n + 2) = 80, thus

n² + 2n = 80 ( subtract 80 from both sides )

n² + 2n - 80 = 0 ← in standard form

(n + 10)(n - 8) = 0 ← in factored form

Equate each factor to zero and solve for n

n + 10 = 0 ⇒ n = - 10

n - 8 = 0 ⇒ n = 8

But n > 0 ⇒ n = 8

width = n = 8 and length = n + 2 = 8 + 2 = 10

Answer:

[tex]b=40.01\ units[/tex]

Step-by-step explanation:

we know that

Applying the law of sines

[tex]\frac{b}{sin(B)}=\frac{a}{sin(A)}[/tex]

[tex]b=\frac{a}{sin(A)}(sin(B))[/tex]

we have

[tex]a=25\ units[/tex]

[tex]A=32.5\°[/tex]

Find the measure of angle B

Remember that the sum of the interior angles of a triangle must be equal to 180 degrees

so

[tex]A+B+C=180\°[/tex]

substitute the given values

[tex]32.5\°+B+26.8\°=180\°[/tex]

[tex]B=180\°-59.3\°=120.7\°[/tex]

Find the length side b

[tex]b=\frac{a}{sin(A)}(sin(B))[/tex]

substitute the values

[tex]b=\frac{25}{sin(32.5\°)}(sin(120.7\°))[/tex]

[tex]b=40.01\ units[/tex]

Answer:

y = - 6x - 57

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

here m = - 6, thus

y = - 6x + c ← is the partial equation

To find c substitute (- 9, - 3) into the partial equation

- 3 = 54 + c ⇒ c = - 3 - 54 = - 57

y = - 6x - 57 ← equation of line

Answer:

y + 3 = –6(x + 9)

Step-by-step explanation:

Answer:

8x² + 4x - 5

Step-by-step explanation:

M - N

= 5x² - (- 3x² - 4x + 5) ← distribute parenthesis by - 1

= 5x² + 3x² + 4x - 5 ← collect like terms

= 8x² + 4x - 5

Answer:

10

Step-by-step explanation:

g (3 (2)² - 4)

g (3 (4) - 4)

g (12 - 4)

g (8)

------

2 (8) - 6

16 - 6

10

To find the value of g(f(2)), we first compute f(2) and then substitute this output into the g(x) function. So, f(2)=8, and g(8)=10, which means that g(f(2))=10.

The question is related to the concept of functions in mathematics. Specifically, it asks to compute the function g(f(2)), where f(x)= 3x^2-4 and g(x)= 2x-6.

First, we need to find the value of f(2).  substitute x=2 in the function f(x). f(2)= 3*(2)^2 - 4 = 3*4 - 4 =12 - 4 = 8.

put this value into the function g(x), so  find g(8). By substituting x=8 in g(x): g(8) = 2*8 - 6 = 16 - 6 = 10.

So, g(f(2)) = g(8) = 10.

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Answer:

The answer is yes , k = -2 and y = -2x ⇒ first answer

Step-by-step explanation:

* To prove the variation

- Check the constant change in the values of x and y

- Lets check that from the table

# At x = 1 ⇒ y = -2

# At x = 3 ⇒ y = -6

# At x = 5 ⇒ y = -10

* -6 - -2 = -6 + 2 = -4 ⇒ 3 -1 = 2

 -10 - -6 = -10 + 6 = -4 ⇒ 5 - 3 = 2

∴ y decreased by 4 when x increased by 2

* This is a constant change

∴ y is varies directly with x

∴ y ∝ x

∴ y = k x ⇒ where k is the constant of the variation

* Lets find the value of k

- You can use one value of x and y from the table

∵ x = 3 and y = -6

∴ -6 = k (3) ⇒ divide two sides by 3

∴ k = -2

∴ The equation of the variation is = y = -2x

* The answer is yes , k = -2 and y = -2x

Answer:

Yes, k=-2 and y=-2x

Step-by-step explanation:

Using (1,-2) and (3,-6)

[tex]k=\frac{-6--2}{3-1}=-2[/tex]

This implies that

y=-2x

check for the 3rd point;

When x=5,

y=-2(5)=-10

Hence y varies directly as x. The constant of variation is k=-2

Answer: Option B

16.8 minutes

Step-by-step explanation:

Machine A produces 75 fishing lures per minute.

Machine B produces 50 fishing lures per minute.

Let's call t time in minutes.

So we want to know how long it will take to produce 2100 fishing lures

We propose the following equation

[tex]75t + 50t = 2100[/tex]

Now we solve for t

[tex]125t = 2100[/tex]

[tex]t = 16.8\ min[/tex]

The answer is Option B

Answer:

many answers,

Step-by-step explanation:

she could make 9 mugs, (3/4 x 9 = 12)

she could make 1 small bowl, 1 small plate, 2 large bowls and 2 mugs. (2.5 + 1.5 = 4, 3.25 x2 = 6.5  .75 x 2 = 1.5; 4+ 6.5= 10.5  10.5 + 1.5 = 12) etc

ANSWER

[tex]\frac{ {x}^{2} }{ 16} + \frac{ {y}^{2} }{ 9} = 1[/tex]

EXPLANATION

The given ellipse has a vertex at (4,0), a co-vertex at (0,3), and a center at the origin.

The equation of an ellipse with vertices on the x-axis and center at the origin is:

[tex] \frac{ {x}^{2} }{ {a}^{2} } + \frac{ {y}^{2} }{ {b}^{2} } = 1[/tex]

The ellipse has vertex at (4,0) , hence a=4.

Also the co-vertex is at (0,3) , b=3

We substitute the values into the equation to get:

[tex] \frac{ {x}^{2} }{ {4}^{2} } + \frac{ {y}^{2} }{ {3}^{2} } = 1[/tex]

[tex] \frac{ {x}^{2} }{ 16} + \frac{ {y}^{2} }{ 9} = 1[/tex]

The equation of the ellipse centered at the origin with a vertex at (4,0) and a co-vertex at (0,3) is (x/4)² + (y/3)² = 1.

The ellipse in question has a vertex at (4,0) and a co-vertex at (0,3), with a center at the origin. The standard form equation for an ellipse with a center at the origin is given by (x/a)² + (y/b)² = 1. In this case, 'a' represents the distance from the center to a vertex, and 'b' represents the distance from the center to a co-vertex. Since our vertex is at (4,0), 'a' equals 4, and  since our co-vertex is at (0,3), 'b' equals 3.

So in this case the standard form equation of the ellipse would be (x/4)² + (y/3)² = 1.

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Answer:

4: 376   8: -708  12: -59  16: 0  18: -1,884

Step-by-step explanation:

I have really bad eyesight so, I hope I read all the numbers correctly. I hope you get caught up, it sucks to be behind in class.

Dividend Divisor = Quotient + Remainder is the formula for dividing two numbers. The answer is follows:

Therefore,

4) -2632/-7 = 376

Use the fraction rule.: [tex]$\frac{-a}{-b}=\frac{a}{b}$[/tex]

-2632/-7

Divide the numbers as follows:

2632/7 = 376

8) -7080/10 = - 708

12) 4956/-84 = -59

16) 0/-600 = 0

18) (-3768/-6) (-3) = 18

Within parentheses, compute (-3768 /-6) : -6

= -6(-3)

Divide and multiply (left to right) -6(-3 ) : 18

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Answer:

12

Step-by-step explanation:

We know that 15/20 students voted in the StuCo election on the first go around.

Using this ratio for 16 student is as simple as multiplying 15/20 by 16

(15/20)*16=12

Based on the voting ratio of 3:4 from Monday's election, we predict that 12 out of the 16 students present on Tuesday voted.

The question asks to predict the number of students who voted in Tuesday's election based on the ratio of students who voted on Monday. On Monday, 15 out of 20 students voted, which establishes a voting ratio of 15:20, or 3:4 when simplified. To predict Tuesday's voter turnout, we apply this ratio to the 16 students present on Tuesday.

Using the simplified ratio of 3:4, for every 4 students, 3 vote. Since 16 students were in class on Tuesday:

Therefore, we predict that 12 students voted in Tuesday's election.

Answer:

slope = 5

Step-by-step explanation:

The equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

y - 3 = 5(x - 4) ← is in point- slope form

with slope m = 5

Answer:16

Step-by-step explanation:

original price

100

=  

new price

new percent

;

64.5

100

=  

75

x

64.5x = 7500 → x ≈ 116.3

Subtract 100 from the new percent (116.3 − 100 = 16.3) → 16%

The approximate percentage of the tip is 14%.

A ratio or value that may be stated as a fraction of 100 is called a percentage. And it is represented by the symbol '%'.

Given:

Dinner at your favorite restaurant cost $64.50 with tax for you and your family.

You give the waiter $75 to pay the bill and a tip.

That means,

the tip amount = 75 - 64.50

= 10.50

The tip percentage,

= 10.50 x 100 / 75

= 14%

Therefore, 14% is the required percentage.

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Answer:

Well, to find the area of a:

square and rectangle you multiply (Length x Width) the formula is (LxW)

triangle you multiply (Base x Height) ÷ 2 the formula is (BxH/2)

The meaning of area is: the number of unit squares that can be contained in an object.

The meaning of volume is: the number of unit cubes that completely fill up a solid figure such as an ice cube.

To find the surface area of an object you:

Multiply the length times the width. (of only one side)

But for a triangle you multiply the base times the height, then divide the answer by 2 ( of only one side)

To find the volume you multiply the length times width times height.

But for a triangle you multiply the base times height.

Hope I helped ; )

Final answer:

The surface area and volume of shapes can be found using specific formulas. Surface area is the total area of the outside surface of a three-dimensional object, while volume is the amount of space occupied by the object.

Explanation:

The surface area and volume of certain shapes can be found using specific formulas.  Surface area refers to the total area of the outside surface of a three-dimensional object. It is measured in square units. The formula for surface area depends on the shape of the object. For example, the formula for the surface area of a rectangular prism is SA = 2lw + 2lh + 2wh, where l, w, and h represent the length, width, and height of the prism.

Volume, on the other hand, refers to the amount of space occupied by a three-dimensional object. It is measured in cubic units. Like surface area, the formula for volume also depends on the shape of the object. For a rectangular prism, the formula is V = lwh.

Answer:

C

Step-by-step explanation:

We can point plot to get graph of both the functions.

** Attached is the graph of both the functions. f(x) is in RED & g(x) is in BLUE.

From the graph shown, it is clear that the point of intersection is x = 4, y = 2

So f(x) = g(x) at the point x = 4

Answer choice C is right.

Answer:

r = - 6

Step-by-step explanation:

Given

6r + 7 = 13 + 7r ( collect terms in r on the left and numbers on the right )

Subtract 7r from both sides

- r + 7 = 13 ( subtract 7 from both sides )

- r = 6 ( multiply both sides by - 1 )

r = - 6

6r+7=13+7r

-6r -6r

------------

7=13+1r

flip the equasin to make it easier

13+1r= 7

-13 -13

---------

1r= -6

Nope, it aint there. False

Answer:

I think it shifts horizontally by 7 units to the right. Not completely sure though.

Step-by-step explanation:

Answer:

(0, 7]

Step-by-step explanation:

Let's call the width W and the length L.  The length is 18 feet more than the width, so:

L = W + 18

The area can be no more than 175, so:

A ≤ 175

LW ≤ 175

Since L = W + 18:

(W + 18) W ≤ 175

W² + 18W ≤ 175

W² + 18W - 175 ≤ 0

(W - 7) (W + 25) ≤ 0

-25 ≤ W ≤ 7

However, the width of the table can't be nonpositive, so:

0 < W ≤ 7

Or in interval notation, (0, 7].

44%

1. We assume, that the number 375 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 100% equals 375, so we can write it down as 100%=375.

4. We know, that x% equals 165 of the output value, so we can write it down as x%=165.

5. Now we have two simple equations:

1) 100%=375

2) x%=165

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

100%/x%=375/165

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 165 is what percent of 375

100%/x%=375/165

(100/x)*x=(375/165)*x       - we multiply both sides of the equation by x

100=2.27272727273*x       - we divide both sides of the equation by (2.27272727273) to get x

100/2.27272727273=x

44=x

x=44

Answer:

47.5 miles

Step-by-step explanation:

So, every morning, you travel 4.75 miles to get to school... and another 4.75 miles in the afternoon to return.

So, each day, you travel a total of 9.5 miles (4.75 + 4.75) to go school and back.

On a typical school week, you'll go to school 5 times... so you'll need to travel a total of 47.5 miles (5 * 9.5).

the standard form of the equation of a parabola that opens up or down is (x - h)^2 = 4p(y - k)  

Answer: y=ax^2+bx+c

Step-by-step explanation: