C.xy 13. What is the difference of (12b?) and (5b?). A. -17b2 B. -7b2 C. 7b2 D.17b2 14. What is the difference of (-12xy) and (-11xy)? A. - 23xy B.-XY D. 23xy 15. If (20m2 + n?) is subtracted from (20m2 - 19n), what is the difference? A.-20n2 B.-18n2 C. 40m2 - 20n2 D. 40m² - 18n2 16. Which of the following is similar to - x 4y 3 ? A. x2y4 B. x 4y2 C. x 3y4 D. x “y3 17. What is the difference of (7b2) and (bº)? A.-7b2 B.- 6b2 C. 6b2 D. 762 18. What is the difference of (- 4xy) and (-5xy)? A. - 9xy B. - xy D. 9xy 19 What is the sum of (5m2 - 7n?) and (8m2 +6n)? A. 13m2-n2 C. 3m2-13n2 B. 13m2 + n2 D. 3m² + 13n 20.If you combine the expressions (3x2 + 4x +7), (x2+2x+8) and (4x2 - 5x-6) what is the sum? A. 7x2-X-9 B. 8x2 - X-9 C. 7x2 + x + 9 D. 8x2 + x +9 C. ху
