Astudent cost for last semester at her community college was $2400. she spent $264 of that on books. what percent of last semester college costs was spent on books

Is a positive integer raised to a negative power always positive

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.