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julia-pushkina [17]
3 years ago
14

jonathan helps his father every summer with the family business in pool cleaning. they are on pool with a clogged drain. it take

s 8 hours to drain 3/5 of the pool. how long will it takes the pump to drain the entire pool?
Mathematics
1 answer:
ollegr [7]3 years ago
5 0
If it takes 8 hours to drain 3/5.
How long would it take to drain 5/5

Cross multiplication
8 hours = 3/5
x hours = 5/5

(5/5 × 8) ÷ 3/5
13.3 hours.

Hope this helped
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Answer:

The margin of error for the 99% confidence level for this sample is ±2.23.

None of the given figures is close to the answer:

E. None of the above

Step-by-step explanation:

margin of error (ME) around the mean can be calculated using the formula

ME=\frac{z*s}{\sqrt{N} } where

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Using these numbers we get:

ME=\frac{2.576*15}{\sqrt{300} }  ≈ 2.23

7 0
3 years ago
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To find the answer we simply work out the equation.
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cos (75) * x = 10. Here, I simply multiplied both sides by x to move x to the left hand side of the equation.

x = 10 / cos (75) Here, I divided cos (75) on both sides to move cos (75) to the right hand side of the equation.

The cosine of 75 is 0.92175127, so, 10 / 0.92175127 = 10.8489137
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3 years ago
What is the sum of the digits of all 2-digit numbers from 10-99?
IRISSAK [1]
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PLEASE GIVE BRAINLIEST

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