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

An angle that measures between 90 and 180° is called a(,

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0