Which of the following shows the sum of the polynomials −3x2+3y2+4x and 4x2−4y+2? a. −3x2+3y2+4x+4x2−4y+2 b. −x2+3y2+4x−4y+2 c. x2+3y2+4x−4y+2 d. 7x2+3y2+4x+4x2−4y+2

3x+9+4x+x=8x+9that's the answer for your question.

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