What adds to negative 13 and multiplies to 42

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

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8