Christina estumates that she will spend 250 but she actually spends 350 what is the percent error

You are constructing a histogram for scores that range from 70 to 100 in whole points. frequencies range from 3 to 10; that is, every whole-point score between 60 and 100 occurs at least 3 times, and at least one score occurs 10 times. which of these would probably be the best range and size for the score intervals along the x-axis?

The system of equations graphed below has how many solutions? y = 2x + 2

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)