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qaws [65]
2 years ago
8

The number of chairs Amal can paint varies directly with the amount of time she spends painting. Amal can paint 7 chairs in 2 ho

urs.
Based on this information, how many chairs can Amal paint in 8 hours?

Enter your answer as a whole number. Do NOT type the word "chairs" in your answer. ONLY type the whole number that is your answer.
Mathematics
2 answers:
Aleksandr [31]2 years ago
6 0

Answer: B

Step-by-step explanation:

I took the test already

nydimaria [60]2 years ago
5 0

Answer: 28

Step-by-step explanation:

If it takes 2 hours to paint 7 chairs, then you multiply both by 4 to get 8 hours for 28 chairs.

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The Sahara Desert has an area of approximately 9 400 000 km^2. While estimates of its average depth vary, they center around 150
Andrew [12]

Answer:

a). 1.128\times 10^{25} grains

b). \frac{1}{8000}

c). 6.54305\times 10^{7} years

Step-by-step explanation:

a). Given Sahara desert has an area of approximately = 9400000 km²

= 9400000×(10000000000) cm²

= 9.4\times 10^{16} cm²

Depth of the desert = 150 m

= 15000 cm

Volume of desert = Area × Depth

= 9.4\times 10^{16}\times 15000

= 1.41\times 10^{21} cm³

Since 1 cm³ holds sand grains = 8000

Therefore, Grains in Sahara Desert = 1.41\times 10^{21}\times 8000

= 1.128\times 10^{25}

b). Since 1 cm³ = 8000 grains

1 grain = \frac{1}{8000} cm³

c). A truck can carry sand = 20.5 m³ Or 20.5\times (10^{2})^{3} cm^{3}

= 2.05\times 10^{7} cm³

Now time taken to recreate Sahara Desert = \frac{\text{Total amount of sand}}{\text{Sand in one truck}}\times 30 seconds

=  \frac{1.41\times 10^{21}}{2.05\times 10^{7}}\times 30

= 20.6341463\times 10^{14} seconds

= \frac{20.6341463\times 10^{14} }{365\times \times 24\times 3600} years

= 6.54305\times 10^{7} years

6 0
3 years ago
Solve the system using subtitions {5x-y=5 <br> 5x3y=15
denis23 [38]

Answer:

I just googled it

Step-by-step explanation:

5 x − y = 15

Add  y  to both sides of the equation.

5 x = 15 + y

Divide each term by  5  and simplify.

x= 3 + y 5

6 0
3 years ago
Please help me. <br> What is 22% of 400?
Zolol [24]

Answer:

88

Step-by-step explanation:

you multiply 400 by 22 % = 88

400 x .22 = 88

6 0
3 years ago
Read 2 more answers
Last week Amelia runs 5 miles in 10 minutes and she jogs 8 miles in 15 minutes. At this rate, how many total miles if she spent
Lady_Fox [76]

Answer:

46 MI

Step-by-step explanation:

5:10

8:15

X:60

Y:30

30+16

46

3 0
3 years ago
The combined area of a square and a rectangle is 225 square yards. the length of the rectangle is 8 times the width of the recta
snow_lady [41]

Answer:

The rectangle:  <u>L = 40 yards.   W = 5 yards</u>

The square: The length and width are both <u>5 yards</u>.

Step-by-step explanation:

<u>Let L and W be the length and width of the rectangle. </u>

<u>Let l and w be the length and width of the square.</u>

Area for each is:

Rectangle:  L*W

Square:       l*w

We are told that <u>L*W + l*w = 225 yards^2</u>

We are also told that

<u>L = 8W </u>

and that

<u>l = W</u>

Since the sides of a square are all equal, w is also W:  <u>w=W</u>

Summarizing and substituting:

L*W + l*w = 225 yards^2

(8W)*W + W*W = 225 yards^2

8W^2 + W^2 = 225 yards^2

9W^2  = 225 yards^2

W^2 = 25

W = 5 feet

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

Therefore, since L = 8W <u>,</u> <u>L = 40 yards.   W = 5 yards</u> for the rectangle.

The square:  l=W, so <u>l = 5 yards, and thus w=5 yards</u>

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

Check:

Do a rectangle of 40' x 5' plus a square of 5' x 5' have a total combined area of 225 yards^2?

40yd x 5yd + 5yd x 5yd = 225 yards^2?

200 yd^2 + 25 yd^2 = 225 yards^2?

YES

5 0
2 years ago
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