F(x)=19,000•0.96x, which models the value of Mark’s car, where x represents the number of years since he purchased the car.
What is the approximate value of Mark’s car after 7 years rounded to the nearest dollar?

a
$14,278
b
$14,000
c
$14,277
d
$14,280

Subtracting is the opposite of adding

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.