1+1=? i am extremely stuck on this one

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Use the four functions below for this question. compare and contrast these four functions using complete sentences focus on the slope and y- intercept first, and then on any additional properties of each function

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12