Which equation represents an exponential function that passes through the point (2, 80)? f(x) = 4(x)5 f(x) = 5(x)4 f(x) = 4(5)x f(x) = 5(4)x

Option 4

Step-by-step explanation:

Functions 1 and 2 are not exponential functions because they do not have the form

.

Where:

a is the main coefficient

b is the base

x is the exponent

The fastest way to solve this problem is to replace the point (2, 80) in the options 3, and option 4.

make x = 2 and check function

3.

---------------------------------

4.

The function 4 is equal to 80 when x = 2.

Then the correct option is option 4

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

step-by-step explanation: