Rick's phone service charges $12.52 for an activation fee plus $6 for every gigabyte (g) used. which of the following graphs models the situation?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Is this a polynomial function? i need to know asap

What is x and y intercepts for y=x+7