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asambeis [7]
3 years ago
5

As a water quality assurance employee for local Aqua America, Inc branch record a drop in water levels from 28 feet to 7 feet at

your reservoir. What is your percentage decrease?
Mathematics
2 answers:
Bad White [126]3 years ago
8 0
7 is 1/4 of 28, so 7 is 25% of 28.
The drop from 28 to 7 is a drop of 21.
21 is 3 times 7, so 21 is 3 times 25%.

Answer: It is a 75% decrease.
Veseljchak [2.6K]3 years ago
5 0

Answer:

Percentage decrease in the reservoir level is 75%.

Step-by-step explanation:

Initial level of the water in the reservoir was recorded = 28 feet

Level of water at the reservoir after the drop = 7 feet

Decrease in the water level = (28 - 7) = 21 feet

Now to calculate the percentage drop we will apply the formula,

Percentage change = \frac{\text{Net change}}{\text{Initial level}}\times 100

= \frac{21}{28}\times 100

= 75%

Percentage decrease in the reservoir level is 75%.

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Work out the angle of x please answer ASAP!!
geniusboy [140]

Given:

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To find:

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6 0
3 years ago
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3 years ago
An audiometer produces a pure tone with a frequency f of 1200 hertz (cycles per second). The maximum pressure P produced from th
Scilla [17]

Answer: Pressure(t) = 5mP*sin(191.08*t)

Step-by-step explanation:

The information we have:

Maximum pressure P = 5 mP

frequency = 1200Hz

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when t = 0, P = 0, so we should use a sin function (because sin(0) = 0)

Then we can write this as:

Pressure(t) = P*sin(c*t)

where t is time in secnds, P is the maximum pressure 5mP, and c is a constant that depends on the period.

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knowing that the period is 1/1200 seconds, we have that:

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3 0
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