please help 21 a b and c

Answer:

8 students got an A

Step-by-step explanation:

20 x 0.40 = 8

Brainliest please

Answer:

y66677

Step-by-step explanation:

Answer: hope this helps ♡

Lily had 16 stamps and Mackenzie had 20 stamps.

Step-by-step explanation:

Lily gives 4 stamps to Mackenzie

(Mackenzie)     m + 4 = 2(L - 4)      (Lily)

Solve for Lily:

m + 4 = 2L - 8

m + 4 + 8 = 2L

(m + 12) ÷ 2 = 2L ÷ 2

(m + 12) ÷ 2 = L

L = (m + 12) ÷ 2 (we will substitute this value for L in the second equation)

Mackenzie gives 4 stamps to Lily

(Mackenzie)     m - 4 = L + 4      (Lily)

m - 4 = ((m + 12) ÷ 2) + 4

m × 2 - 4 = ((m + 12) ÷ 2 × 2) + 4

2m - 4 + 4 = (m + 12) + 4 + 4

2m - m = (m - m + 12) + 8

m = 12 + 8

m = 20 (we will substitute this value of m in the next equation)

L = (m + 12) ÷ 2

L = (20 + 12) ÷ 2

L = 32 ÷ 2

L = 16

Answer:

A cylinder with a radius of 1 cm and a height of 10 cm

Step-by-step explanation:

sorry no explanation, its correct!

Answer:

sorry if this is wrong

Step-by-step explanation:

a. 3

b.15

c.8

Answer:

7/256

Step-by-step explanation:

an = a1 * (1/2)^n-1

a9 = 7(1/2)^9-1

a9 = 7(1/2)^8

a9 = 7/256

Answer:

5 1/7

Step-by-step explanation:

First, make both numbers into a fraction

9/1 x 4/7

multiply top and bottom

36/7

simplyfy- 7 goes into 36 five times with 1 left over.

5 1/7

Answer is 0.35 inches

Answer:

24 years

Step-by-step explanation:

let Donald's age be x

then Nicole's age would be 1/2 * x = x/2

now, x + x/2 = 72

3x/2 = 72

3x = 72*2

x = 144/3 = 48

Donald's age is 48, so Nicole's age is 1/2 * 48 = 24 years.

Answer:

12x+4

Step-by-step explanation:

To find the perimeter of any shape you just have to take the sum of all the sides.

In this case you would write:

 4x+2 (side 1) +2x (side 2) +4x+2 (side 3) +2x (side 4)

Now you just have to simplify the expression which would give you:

12x+4 (after collecting like terms)

So the final answer will be 12x+4

Answer:

3 pieces of paper

Step-by-step explanation:

The questions asks you to state the number of paper pieces that have a number 8 or greater written on it. In numbers 1-10, there are three numbers 8 and greater- 8, 9, and 10.

Answer:

number one is i thinks 10000000

Step-by-step explanation:

Answer:

25 (c)

Step-by-step explanation:

Answer: (13) 128 (14) 3 (15) 38 (16) 21

Step-by-step explanation:

13) (x+3)+49=180

14) 66+8x=90

15) (x+3)+49=90

16) 3x+117=180

Answer:

Hi, your answer will be 5/8 x 2/8.

Step-by-step explanation:

When multiplying fractions, you are to do both the numerators and denominators. So, if you do 5/8 x 2/8, that would result as 10/16. When you simplify, that would be 10/16 divided by 2, which is 5/8.

Hope this helps! :)

Answer:

5

Step-by-step explanation:

because of you use a number line -4 is 5 points away from 9

Positive

Answer:

A

Step-by-step explanation:

because the top number is cubed

Answer:

I believe your answer would be A. It is the only fraction.

Step-by-step explanation:

Answer:

the 13th one is 115

Step-by-step explanation:

The formula relations given by Pythagorean theorem is used to

determine the lengths and area of the given squares and triangles.

Responses:

1. Area of a is H: 25

2. Length of b is I: 5

3. Length of C is A: 7.94

4. Area of d is B: 35.73

1. Given;

The area of the side squares are; 9 m² and 16 m²

According to Pythagorean theorem, we have;

Area of square a = 9 m² + 16 m² = 25 m²

2. b² = Area of side square a

Therefore;

b = √(25 m²) = 5 m

3. Given;

Area of the squares adjacent to the hypotenuse side and a leg are;

144 m² and 81 m² respectively

According to Pythagorean theorem, we have;

C² = 144 m² - 81 m² = 63 m²

C = √(63 m²) = √(9 × 7 m²) =  3·√7 m ≈ 7.94 m

4. Area of triangle d = [tex]\frac{1}{2}[/tex] × √(81 m²) × 7.94 m ≈ 35.73 m

Learn more about Pythagorean theorem here:

https://brainly.com/question/390911

Answer:

afhs

Step-by-step explanation:

i said so

Answer

Nine and two thirds miles

Step-by-step explanation:

Convert the mixed numbers to improper fractions, then find the LCD and combine.

Exact Form:

29

¯

3

Decimal Form:

9.  6

Mixed Number Form:

9

2

¯

3

Answer:

8.2 ft

Step-by-step explanation:

33.62 * 2 / 8.2 = 8.2 ft

Answer: 4.1

Step-by-step explanation:

33.62 ÷ 8.2 = 4.1

Answer:

The length can be 5 and the width 10.

Step-by-step explanation:

perimeter is equal to 2L + 2W

area is equal to L * W

you get 2 equations:

30 = 2L + 2W

50 = L*W

we'll solve by substitution.

you can use either equation to solve for either variable.

we'll use the second equation to solve for L.

second equation is:

50 = L*W

divide both sides of this equation by W to get:

L = 50/W

we now have a value of L that we can substitute in the first equation which we can then use to solve for W.

the first equation is:

30 = 2L + 2W

replace L with 50/W to get:

30 = 2*(50/W) + 2W

simplify to get:

30 = 100/W + 2W

multiply both sides of this equation by W to get:

30W = 100 + 2W^2

subtract 30W from both sides of this equation to get:

2W^2 - 30W + 100 = 0

factor this equation to get:

(2W - 20) * (W - 5) = 0

solve for W to get:

W = 10 or W = 5

if W = 10, then use the equation of 50 = L*W to get L = 5

if W = 5, then use the equation of 50 = L*W to get L = 10

you have 2 possible solutions.

L = 5 and W = 10 or:

L = 10 and W = 5

both are plausible so we'll test them both out.

when L = 5 and W = 10:

the first equation becomes 2*5 + 2*10 = 10 + 20 = 30

the second equation becomes 5*10 = 50

both equations confirm that the solution of L = 5 and W = 10 is good.

when L = 10 andW = 5:

the first equation becomes 2*10 + 2*5 = 20 + 10 = 30

the second equation becomes 10*5 = 5

both equations confirm that the solution of L = 10 and W = 5 is good.

the ticket can have either:

a length of 5 and a width of 10 or:

a length of 10 and a width of 5.

since the length is usually longer than the width, you are free to choose that the ticket most likely has a length of 10 and a width of 5.

alternatively, you can simply say that the dimensions are 5 by 10 and let the recipient of that information determine which is the length and which is the width.

mathematically, the length can be 10 and the width 5 or the length can be 5 and the width 10.