A cell phone costs $750 and loses 28% of its value each year. Write an exponential decay function to represent this situation. 1. f(x)= 750 • 0.72^x
2. f(x)= 0.72 • 750^x
3. f(x)= 750 • 0.28^x
4. f(x)= 0.28 • 750^x

1.

Step-by-step explanation:

The cell phone experiments an exponential depreciation, which is defined by the following formula:

, for . (1)

Where:

- Initial cost, measured in monetary units.

- Depreciation rate, no unit.

- Time, measured in years.

- Current value of the cell phone, measured in monetary units.

If we know that and , then the exponential decay function that represents the situation is:

Which means that correct answer is 1.

56

step-by-step explanation:

answer: 177/8

step-by-step explanation: