1.14. Which of the following functions represents exponential decay? Select all that apply. A. f (x) = (1.03)
x
B. f(x) = (1.97)
x
10
C. f (x) = (0.97)
x
D. f (x) = (0.03)
−2x
E. f (x) = (1.23)
−4x
F. f(x) = (0.5)
x
2

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?