a school has 20 classrooms one-fourth of them are for kinder and first grade. twice as many are for second and third grade. the rest are for fourth and fifth grade. how many fourth and fifth grade classes are there?

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.