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For each situation, define variables and what units they might have (no need to write formulas). State whether the quantity is changing in a linear or exponential fashion.

A savings account, which earns no interest, receives a deposit of \$723 per month.

The value of a machine depreciates by 17% per year.

A liter of water evaporates from a swimming pool every day.

Every 124 minutes, 12 of a drug dosage remains in the body.

Guest Feb 14, 2018
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A savings account, which earns no interest, receives a deposit of \$723 per month.

Linear......let  A be the amount accumulated in dollars and M  the number of months the deposit is made

The value of a machine depreciates by 17% per year.

Exponential.....let  V be the value in dollars  after  T  years

A liter of water evaporates from a swimming pool every day.

Linear......let A be the amount of water in liters remaining in the pool after D  days

I think the last is supposed to be

Every 124 minutes, 1/2 of a drug dosage remains in the body.

Exponential.....this is a decay situation.....let   AO be the original amount (in cm^3)  and AT the amount remaining after T minutes

CPhill  Feb 14, 2018

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