You need some money today and the only friend you have that has any is a miser. he agrees to loan you the money you need, if you make payments of $30 a month for the next six months. in keeping with his reputation, he requires that the first payment be paid today. he also charges you 2 percent interest per month. how much total interest is he charging?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Complete the equation of the live through (-1,6) (7,-2)

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.