Find the value of y, x and z and give the full explanation

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Given the conditional statement, match the following. conditional statement: if two lines intersect, then their intersection is one point.

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?