A students cost for last semester at her community college was 2100.she spent 315 of that on books. what is the percent of last semesters college costs was spent on books

Yuri, sam and dani had the same math homework last night, but none of them finished it. yuri finished 3/8 of her homework, sam finished 4/6 of her homework and dani finished 1/2. who finished the most math homework? who finished the least amount?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5