Scott was going to sell all of his stamp collection to buy a video game. After selling half of them he changed his mind. He bought 15 more. How many did he start with if he now has 40?

Find the slope and intercepts for each line.

Ruth contributes 18% of the total cost of her individual health care. This is $67.50 deduction from each of her biweekly paychecks. What is the total value of her individual coverage for the year?

Suppose that 9% of the general population has a disease and that the test for the disease is accurate 70% of the time. What is the probability of testing positive for the disease? A. 33.6% B. 33.2% C. 32.4% D. 32.8%

How do you subtract 7 and one fourth and 4 and 11 twelves

Start solving #2 with the substitution method 2. a + b + c = 9 a - 8b - C = - 27 2a - b + c = 6

Simplify the expression below. -5 (2x - 1) + 3x

Are all cubes congruent

Find the normal form of the equation of the plane that passes through p = (0, - 4, 5) and is parallel to the plane with general equation 3x - y + 5z = 3.

Five times a number x minus 9 is two thirds of a number y. What is the equation?

The maximum weight an airline allows for a suitcase is 50 pounds. Ella's suitcase weighs 8 pounds empty. If Ella meets the requirements, what could be the weight of the contents of her suitcase?