Please help

i really need it

marking brainlist

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?

Use the distance formula to find the distance between (-3,5) and (3,1)

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)