Evaluate. -3x^3 -4x for x -1. a.1 b.7 c.-1

Hello,

f(x)=-3x^3-4x
f(-1)=-3*(-1)^3-4*(-1)=-3*(-1)+4=3+4=7

Answer B

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post