B. Directions: Find the sum of the following polynomials. Then choose and write the letter of the correct answer in the space provided: C.-18xy - 16 D. 18xy - 24 16. 74xy + 18 and A. 18xy - 16 17.-84a + 21 and A. -181a + 33 18. 7x - 9y + z and A. 15X-8y + 5z –56xy - 34 B. 18xy + 16 -97a + 12 B-183a - 33 8x + y + 4z B. 15x + 8y + 5z C. 181a + 33 D. -183a + 11 - C. 15x - 8y-52 D. -15% - 8y + 5z C. Directions: Subtract the second from the first. Write your answer on the space provided. 19. 18x2 - 4y2 and 18x2 + y² 20. 14a - 19b + 12c and 23a -13b + 21c -
if alm nyo please answer if you dont know just please don't answer​