The sum of the square of a positive number and the square of 4 more than the number is 208

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81