Simplify each expression 8+7y-3y+2-4

Answer: 27

Step-by-step explanation:

Answer: all real numbers expect ZERO

Step-by-step explanation:

Answer:

B. 35

Step-by-step explanation:

1. Multiply 15 by 21 to get 315 ft.

2. Convert square feet to square yards to get 35

3. There are 3 feet in ONE yard. The question asks you to convert the area from SQUARE feet to SQUARE yards. Squared means two. Three feet (or one yard) doubled is 9, so divide 315ft by 9.

4. 315 divided by 9 gives you 35

(This answer is correct according to the Official 2020-2021 ACT Practice Test answer sheet)

The area of the floor in square yards will be 315 square feet's.

The area of the square and rectangle is -

Square = [x]²           {x is the side of a square]

Rectangle = L x B    {L is the length and B is breadth}

Given is a room has a rectangular floor that is 15 feet by 21 feet.

We have room that has a rectangular floor that is 15 feet by 21 feet.

The area of the rectangle will be -

A = 15 x 21

A = 315 square feet's.

Therefore, the area of the floor in square yards will be 315 square feet's.

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Answer:

[tex]\frac{2}{3}[/tex]

Step-by-step explanation:

Sum the frequency column to find the total number of students

total = 2 + 9 + 5 + 5 + 3 = 24

number of students finished in less than 20 mins = 2 + 9 + 5 = 16

fraction of students = [tex]\frac{16}{24}[/tex] = [tex]\frac{2}{3}[/tex]

Answer:

[tex]2\pi \: r \\ 2 \times \pi \times 7 \\ = 14\pi[/tex]

The answer is -1

Step-by-step explanation:

Answer:

Rotation, then translation

Step-by-step explanation:

At first, the triangle MNQ rotates around the point center Q 180° counter clockwise without change the distance among the three points so it does change the shape the the object.

Then,  we apply translation towards right so that it will became ΔPQN without resizing or rotating the object.

Hence,  transformation(s) can map MNQ onto PQN are Rotation, then translation

Answer:

the probability is 1/12

Step-by-step explanation:

The probability, P(Tails) to get tails is equal to:

[tex]P(Tails)=\frac{1}{2}[/tex]

Because a penny have two possible options heads or tails and tails is one option.

Additionally, the probability P(3) that the number cube get a 3 is equal to:

[tex]P(3)=\frac{1}{6}[/tex]

Because the cube have 6 possible options and 3 is one option.

Now, the probability P(tails and 3) is calculated as a multiplication of P(tails) and P(3). then, P(tails and 3) is equal to:

P(tails and 3) [tex]=\frac{1}{2}*\frac{1}{6}=\frac{1}{12}[/tex]

Answer:

1/12

Step-by-step explanation:

First we calculate the probability of the coin tossed being a tails.

The coin has two sides (heads and tails), so the probability of each case is 1/2, so the probabilty of having a tails is 1/2

For the number cube, we have six possibilities, so the probability of having a number 3 is 1/6

Now, to find the final probability P(tails and 3) we just need to multiply both probabilities:

P(tails and 3) = P(tails) * P(3) = (1/2) * (1/6) = 1/12

Answer:

[tex]y = 1/2x + 6[/tex]

Step-by-step explanation:

Step 1:  Find the equation

[tex](y - y_1) = m(x - x_1)[/tex]

[tex](y - (5)) = 1/2(x - (-2))[/tex]

[tex]y - 5 = 1/2(x + 2)[/tex]

[tex]y - 5 + 5 = 1/2x + 1 + 5[/tex]

[tex]y = 1/2x + 6[/tex]

Answer:  [tex]y = 1/2x + 6[/tex]

Answer:

5

Step-by-step explanation:

4/4 crosses out and 20/4=5 so x=5

Answer:

x = 5

Step-by-step explanation:

since the work is already done for you, all you have to do is divide 20 by 4, which gives you 5.

you can also check this answer by multiplying 4 by 5, which would give you 20, further proving the answer.

Answer:

oh yeah thats the 3rd one

Step-by-step explanation:

Answer:

15000.0

Step-by-step explanation:

Answer:

Step 1:  Round to the nearest hundredth

It is already rounded to the tenth so rounded to the hundredth would just add a 0.

14991.10

Answer:  14991.10

If you meant hundreds:

14991.10

Since the tens place is greater or equal to 5, you round up the hundreds place.  This will make the thousands place go up by one.

14991.10

15000

To estimate the perimeter, we use the given information of the width of the rectangle, which is 1.25 cm. Assuming the lengths are similar, we estimate them to be 1.25 cm as well. Using these measurements, we calculate the perimeter of the figure to be approximately 5 cm.

To estimate the perimeter of the figure, we need to determine the measurements. The given information states that the rectangle is at least 1.0 cm wide but not 2.0 cm wide. Using the tick marks on the ruler, we can estimate the width to be 1.25 cm. Since the perimeter of a rectangle is the sum of all its sides, we find the perimeter by multiplying the width by 2 and adding it to the sum of the two lengths. However, we don't have information about the lengths, so we can't find the exact perimeter, but we can estimate it based on the width. Assuming the lengths are similar, we can use the estimated width of 1.25 cm to estimate the lengths as well.

To estimate the lengths, we can assume that each length is greater than the width. Let's assume the lengths are also 1.25 cm. The perimeter can then be estimated by multiplying the width by 2 and adding it to the sum of the two lengths: (1.25 cm * 2) + (1.25 cm + 1.25 cm) = 2.5 cm + 2.5 cm = 5 cm. Therefore, we estimate the perimeter of the figure to be approximately 5 cm.

The estimated perimeter of the pentagon is 19 units.

To estimate the perimeter of the given pentagon, we need to find the length of each side and add them together. The pentagon has a base of four units and the other sides are three units each.

To find the perimeter, we add the lengths of all the sides. In this case, the base has a length of four units, and there are five sides of three units each.

Calculating the perimeter:
4 + 3 + 3 + 3 + 3 + 3 = 19 units

Therefore, the estimated perimeter of the pentagon is 19 units.

Answer:

-5

Step-by-step explanation:

f(2) = 2 * f(2-1) + 1

f(2) = 2 * f(1) + 1

f(2) = 2(-3) + 1

f(2) = (-6) + 1

f(2) = -5

Answer:

325 servings

Step-by-step explanation:

The athlete can cover 4.5 km in 30 minutes. Hence, option C is correct.

Important information:

We need to find the distance covered by the athlete in 30 minutes.

We know that 1 hour = 60 minutes. So,

The distance covered in 60 minutes is 9 km.

The distance covered in 1 minute is [tex]\dfrac{9}{60}[/tex] km.

The distance covered in 30 minutes is [tex]\dfrac{9}{60}\times 30=4.5[/tex] km.

Therefore, the athlete can cover 4.5 km in 30 minutes. Hence, option C is correct.

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Answer:

-3/5

Step-by-step explanation:

6x + 10y = 8

10y = -6x + 8

10y/10 = -6x/10 + 8/10

y = -3/5x + 4/5

Does that help?

The ratio of the surface areas of the cone shown is 16 : 9.

The area of a three dimensional object on it's outer surface is called the surface area of the object.

Given are two cones.

Also given that,

Ratio of the radii of the cones = 4 : 3

It is given that both cones are similar figures.

So scale factor = 4/3

Surface area of a cone = πr² + πr√h²+r²

Now the surface area is proportional to the square of the radii of the cone.

So ratio of surface area = 4² / 3² = 16 / 9

Hence ratio of the surface area of the cones is 16 : 9.

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Answer:

Explanation:

The table is:

AIRPLANE LIFTING FORCE

Area of Wings   Lifting Force

(square feet)        (pounds)

    125                    1,875

    150                   2,250

    175                   2,625

    250                  3,750

       x                    5,625

    420                      y

The ratio of lifting force to the area is equivalent for all pairs in the table. What are the values of x and y?

1. Calculate x:

Ratio of lifting force to the area for the first pair (row):

Ratio of lifting force to area for the pair with x:

Set the proportion:

Equal the two ratios

Multiply both sides by 5,625 (multiplication property of equalities):

2. Calculate y:

You can use the same know ratio for the first pair: 125/1,875

And set the corresponding proportion, with y:

Invert both sides:

Multiply both sides by 420

The answer is x = 375 square feet and y = 6,300 pounds.

Lynn starts with 14.3 gallons in her gas tank.

Subtraction is a mathematical operation that deducts the right-hand operand from the left-hand operand.

for example 4 -2 = 2

She put 3 7/8 gallons of gas in her gas tank. if there are now 18 1/6 gallons in the tank.

We have to determine the number of gallons did she start with

As per the given question, the required evaluation would be as:

Initial gallons = current gallons - put gallons

Initial gallons = 18 1/6 - 3 7/8

Convert the improper fractions into decimals,

Initial gallons = 18.167 - 3.875

Apply the subtraction operation, and we get

Initial gallons = 14.292 ≈ 14.3

Therefore, she starts with 14.3 gallons in her gas tank.

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Answer:

35a+55b=c

35x3=105

55x2=110

105+110=215

c=215

she rode her bike for 215 mins= 3 hours and 58 mins

Step-by-step explanation:

Answer:

1808.64

Step-by-step explanation:

Answer: C -1.9

Step-by-step explanation:

The rate of change of this simple index over 1 week given the change in the stock prices is -1.9%.

The rate of change is the difference in the total value of the simple index.

Total value of the simple index at day 1 = (4000 x $3.15) + (5000 x $4.30) + (6000 x $4.60) = $61,700

Total value of the simple index at day 8 = (4000 x $3.50) + (5000 x $3.90) + (6000 x $4.50) = $60,500

Rate of change = (60,500 / 61700) - 1 = -1.9%

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Answer:

X = -12.54 (I am a Math Class Topper in both 6th Grade an 7th Grade)

Step-by-step explanation:

5 x .27 = 1.35

8x - (3 x .27) = .81

1.35 + 8x - .81 = 7x - 12

        - 7x           - 7x

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

1.35 + X - .81 = -12

              + .81 +.81

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

1.35 + X = -11.19

-1.35         -1.35

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

X = -12.54

Answer:

[tex]5(2)(6) = 60[/tex]

Answer:

No because if you are looking for a right triangle its sums have to equal to 90 degrees

Step-by-step explanation:

for example:side a; 30 inches

side B;30 in

c;30 that equals 90 so that is a right triangle

Answer:

No, it is not a right triangle.

Step-by-step explanation:

10.5, 36, and 50 do not form a right triangle.  This can be tested using the Pythagorean theorem.  

10.5^2=110.25

36^2= 1296

50^2=2500

If this was a right triangle, the 10.5 squared and 36 squared would have to equal 50 squared.  

Answer:

7 birds

Step-by-step explanation:

Let b = number of birds

c = number of cats

We know there were 13 birds and cats

b+c =13

It is $2 per bird and $5 per cat for a total of $44

2b+5c =44

 Solve b+c =13 for c by subtracting b from each side

c = 13-b

Now we can substitute this into the second equation

2b+5c =44

2b + 5(13-b) =44

Now distribute

2b+65 -5b = 44

Combine like terms

-3b +65 =44

Subtract 65 from each side

-3b +65-65 =44-65

-3b = -21

Divide each side by -3

-3b/-3 = -21/-3

b=7

There were 7 birds

We could also find the number of cats

c =13-7

c =6

Answer:

7 birds

Step-by-step explanation:

No. of birds: x

No. of cats: y

2x + 5y = 44

x + y = 13

x = 13 - y

2(13 - y) + 5y = 44

26 - 2y + 5y = 44

3y = 18

y = 6

x = 13 - 6

x = 7

Answer:

16 miles

Step-by-step explanation:

The graph is counting by 2, and there are 8 spaces between the Grocery store and the post office.  8(2) = 16

Answer: 16

Step-by-step explanation: