<u>you have to round then divide! i know this is late but i hope it will help others! i just did the quiz on edge so i figured i would let everyone know that option c was correct! BRAINLIEST?</u>
The correct answer for part A is 5x² +7x -4. 5x³ -x² -8x -7 is the right answer for part B. Polynomials are always closed if under addition or subtraction. The answers of both parts A and B are polynomials. hope that helps let me know if it does