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alukav5142 [94]
3 years ago
5

It takes 60 minutes for 4 people to paint 8 walls.

Mathematics
1 answer:
katrin [286]3 years ago
8 0


Each person paints 2 walls in 60 minutes ( 8:4=2) that means 1 wall takes 30 minutes for each person( 60:2=30)

For 9 walls , each person paints 1.5 walls ( 9:6= 1.5) that mean 1.5 * 30= 45 minutes

So 6 people need 45 minutes to paint 9 walls



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4(5x + 9)^2 – 33 = -21
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Answer:

x = sqrt(3)/5 - 9/5 or x = -9/5 - sqrt(3)/5

Step-by-step explanation by completing the square:

Solve for x over the real numbers:

4 (5 x + 9)^2 - 33 = -21

Add 33 to both sides:

4 (5 x + 9)^2 = 12

Divide both sides by 4:

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Take the square root of both sides:

5 x + 9 = sqrt(3) or 5 x + 9 = -sqrt(3)

Subtract 9 from both sides:

5 x = sqrt(3) - 9 or 5 x + 9 = -sqrt(3)

Divide both sides by 5:

x = sqrt(3)/5 - 9/5 or 5 x + 9 = -sqrt(3)

Subtract 9 from both sides:

x = sqrt(3)/5 - 9/5 or 5 x = -9 - sqrt(3)

Divide both sides by 5:

Answer:  x = sqrt(3)/5 - 9/5 or x = -9/5 - sqrt(3)/5

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