Evelyn rolled two 1-6 number cubes 72 times. how many times should she predict she will roll a sum of 5

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.