Marizsaturnogo Marizsaturnogo Math Answered MATHEMATICS 15. 8 + 7 = 15 16.4(3-5) = 4(3) - 4(5) 17. 10 + (-10) = 0 18.3(-2) = -2(3) 19.1.8= 8 20.-2x (3 x 5) = (-2 x 3) x 5