Change the percent to a fraction:10%

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

In the geometric progression –3, 12, −48… what term is 3,072?

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