What is the decay factor in the function y=17*0.2^x?

Ill mark the brainliest if you me with the these three questions 7,8,9

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x