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.

answer: the two figures are congruent.

step-by-step explanation: they're congruent because figure efgh is reflected across the x and y axis but it was also rotated.

hope it !

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: