3- 15,16 N4

.The 2"d term in the expansion of (3y - 2x), when written in order of descending powers of y, is A. - 1080xy4 B. -810xy4 C. 810xy* D. 1080xy* Hint: Refer to the binomial expansion formula. 16. If the+ 1 = " Ckx"-ky is used to expand (# - 5x' ) , then the k-value corresponding to the constant term A. is 4. B. is 5. C. is 6. D. cannot be determined. Hint: A constant term does not contain a variable. ooloo er Numerical Response 4. The number of terms in the expansion of (2x - 3y) is Hint: Compare to the number of terms in (x + y). mist