Why do stores offer sales such as buy one, get one at half price or buy two, get one free

How is the rangeof a set of data different from a IQR

The amount of time it takes an ice cube to melt in a glass of lemonade is inversely proportional to the temperature of the lemonade. It takes 30 minutes for an ice cube to melt in a glass of lemonade that is 70 °F.

Emily is entering a bicycle race for charity. Her mother pledges $0.90 for every 0.75 mile she bikes. If Emily bikes 15 miles, how much will her mother donate?

Jake sold 39 tickets to the school fair and Jeanne sold 12 tickets. What is the ratio, in simplest form, of the number of tickets Jeanne sold to the number of tickets Jake sold?

Kim, Beth, and Jenny gave money to buy their mother a birthday gift. The gift cost $40. Kim gave 35% of the money for the gift. Beth gave 3/8 of the money for the gift. How much money did Jenny give to buy the gift?

Triangle A is rotated 180° counterclockwise about the origin. Which figure is the transformed figure?

4 girls and 2 boys are working on an art project. They have four square pieces of felt. If each person gets an equal share of the felt, how much of piece of felt will each person get?

In a hypothesis test if the research question is, "do the data indicate that the mean is different from a specific value?" then is the hypothesis test a two-tail, left-tail, or right-tail test?

Will's bedroom is 12, feet long and 8 feet wide. His closet is half the length and half the width of his bedroom. What is the area of Will's closet floor?

Solve on the interval [0,2pi) 1 + sin 0=1/2