A store has a sale for 20 % off. You decide to buy a $15 t-shirt. A) How much money will you save? B) How much money will you spend on the t-shirt?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z