3/2 dived by 7/8 dived by 1/2

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

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

Three people are traveling and need to exchange the currency of their native country for the currency of the country they are visiting. drag each exchange to the category that shows the ratio of currencies in that exchange.