[tex]a) \ -3+(-7)\cdot 4 = -3-28 = -31\\\\b) \ -17-(-3)\cdot(-8) = -17 - 24 = -41\\\\c) \ 2\cdot(-4)+(-6)\cdot(-3) = -8 +18 = 10\\\\d) \ -5\cdot(-2)-(-8)\cdot2 = 10-(-16) = 10+16 = 26[/tex]
[tex]e) \ 7\cdot(-8)+(-5)^{2} = -56 + 25 =-31\\\\f) \ [-6\cdot3+(-5)\cdot(-4)]\cdot(-9) = (-18+20)\cdot(-9) = 2\cdot(-9) = -18[/tex]
