Factor completely 3x3 + 3x2 − 18x. a) 3x(x + 3)(x + 2)
b) 3x(x + 3)(x − 2)
c) 3x(x − 3)(x + 2)
d) 3x(x − 3)(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?