On the number line, if r < s, if p is halfway between r and s, and if t is halfway between p and r,

then~$s-t \over t-r$~=

If a, b, and c are constants, a > b > c, and x³ - x = (x - a)(x - b)(x - c) for all numbers x, what is the value of b ?

In the coordinate plane, line k passes through the origin and has slope 2. If points

(3,y) and (x,4) are on line k, then x + y =

A corporation that had $115.19 billion in profits for the year paid out $230.10 million in employee benefits. Approximately what percent of the profits were the employee benefits? (Note: 1 billion = 10⁹)

Last year Carlos saved 10 percent of his annual earnings. This year he earned 5 percent more than last year and he saved 12 percent of his annual earnings. The amount saved this year was what percent of the amount saved last year?

Which of the following CANNOT be the greatest common divisor of two positive integers x and y ?

Of the following, the closest approximation to ~$\sqrt{~ 5.98(601.5) \over 15.79 ~}$~ is

In a shipment of 120 machine parts, 5 percent were defective. In a shipment of 80 machine parts, 10 percent were defective. For the two shipments combined, what percent of the machine parts were defective?

René earns $8.50 per hour on days other than Sundays and twice that rate on Sundays. Last week she worked a total of 40 hours, including 8 hours on Sunday. What were her earnings for the week?

~$(-1.5)(1.2)-(4.5)(0.4) \over 30$~=