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Which value of c would make he following expression completely factored? 8x+cy

What is (28 + 7 + 6 + 3) x 1/2 show your work

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