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3 years ago

6

The water level in a vat changed by −9.9 inches in 2.25 hours as the vat was drained. What is the average change in the vat's wa

ter level per hour?

2 answers:

Assoli18 [71]3 years ago

8 0

-9.9 / 2.25 = -4.4 inches per hr

icang [17]3 years ago

6 0

Answer:

-9.9/2.25= -4.4 inches

Step-by-step explanation:

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Answer:

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The amount of pennies doubled each day. So the series is,

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This series is in geometric progression.

As the pennies from each of the previous days are not being stored away until more pennies magically appear so the sum of series will be,

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where,

a = initial term = 1,

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As we have find the number of days that would elapse before she has a total of more than 90 trillion, so

$\Rightarrow 90\times 10^{12}\le \dfrac{1(2^n-1)}{2-1}$

$\Rightarrow 90\times 10^{12}\le \dfrac{2^n-1}{1}$

$\Rightarrow 90\times 10^{12}\le 2^n-1$

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$\Rightarrow n\times \log 2\ge \log (90\times 10^{12}+1)$

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