Pls help because i need to go to basketball practice

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

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a