I believe what your asking is just multiplying it together so 5p(p-3) would be 5p2-15p. the p2 is p squared or a little 2 on top of the p. Hope I helped!
(a)

(b)we have 4 terms in this expression.
(c)+12 is the leading coefficient in

(d) constant is -45
writing the linear equation can be used by any any of those coordinates that are given
Minimum is (4,3) and Vertical intercept is (0,5) correct me if I’m wrong