If the function f is given by f(x)=2x^2-4 then whichof the following represents the value of c such that f(c)=28?

(^ means exponent)

select one:
a. 0
b. 2
c. 4
d. 8

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?