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3 years ago

8

A new type of pump can drain a certain pool in 3 hours. An older pump can drain the pool in 9 hours. How long will it take both

pumps working together to drain
the pool?

2 answers:

stepladder [879]3 years ago

7 0

Together the pool can be drained in 2 hours and 18 minutes.
Or if im correct 4.5 hours

ale4655 [162]3 years ago

6 0

Answer: Together the pool can be drained in 2 hours and 18 minutes.

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denis23 [38]

Answer:

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3x + 2x = 3 - 3

5x = 0

x =0.

So y = 3(0) + 3 = 3.

Step-by-step explanation:

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Mkey [24]

Answer:

$\large\boxed{y=0.6x-3.2}$

Step-by-step explanation:

The slope-intercept form:

$y=mx+b$

m - slope

b - y-intercept

We have

$y=0.6x+3$

Parallel lines have the same slope. Therefore we have the equation:

$y=0.6x+b$

The line passes through the point (-3, -5). Put the coordinates of the point to the equation and solve it for b:

$-5=0.6(-3)+b$

$-5=-1.8+b$ <em>add 1.8 to both sides</em>

$-3.2=b$

Finally we have:

$y=0.6x-3.2$

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Solve for x:

7 x^2 = x + 9

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7 x^2 - x - 9 = 0

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