Which expression is not equivalent to a times c times 5 times 5 ?

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

Find the values of the variables in the kite