Question

Write an exponential function y = abx for a graph that includes
(–4, 72) and (–2, 18).











f(x) = 4(0.2)x





f(x) = 4.5(0.5)x





f(x) = 2(4)x





f(x) = 0.5(4.5)x







15.

Suppose a new car that costs $25,000 depreciates by 12% each year.
In about how many years will the car be worth $15,000? Use the equation 15,000 = (25,000)(0.88)x and round the value of x to the nearest year.











4





6





5





7







16.

Graph the exponential model . Which point lies on the graph?