Write an equation to find t the total cost in dollars for a lunch pass with n lunches

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?