How much would $500 invested at 4% interest compounded continuously be worth after 7 years, round to the nearest cent

Ineed to know the answer to this algebra question.

What is the percentile for data value 6 in the following data set? 4 13 8 6 4 4 13 6 4 13 2 13 15 5 9 4 12 8 6 13 40 25 35 62

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