Write how many expression for this picture

anyone? find the second, fifth, and ninth terms of a sequence where the first term is 65 and the common difference is -7. 72, 93, 121 72, 79, 86 58, 37, 9 58, 51, 44

Can someone pls ! pls answer all. no explanation needed..

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'