Confused with this question

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Find the zeros of each function. f(x) = x^2 + 5x - 6