Alex worked at the library 4 hours each night for 20 nights. he earned a total of $640. how much did he earn per hour working at the library?

You invested $5000 between two accounts paying 4% and 9% annual interest, respectively. if the total interest earned for theyear was $350, how much was invested at each rate? $was invested at 4% andwas invested at 9%.

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

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