Could someone please help me with f and g? I’ll give branliest and a thanks.

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?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

How do i put 3(x+7) in distributive property