Exponential growth/decay function hint/tip: remember, the basic general exponential function form is: y = abx in detail, b is written as (1-r) where r is the rate of growth or decay, so our detailed formula is: y = a(1-r)x always work with the rate as a decimal number, not as percentage. if the rate is given as percent (%), you will need to divide it by 100 to have the decimal form. the value of a car is $21,500. it loses 12% of its value every year. (a) write a function that represents the value y (in dollars) of the car after x years. (b) use the function to estimate the value of the car after 6 years. (round your answer to the nearest whole number)