in an 7th grade class with 80 people, seven tenths of the students wore shorts, how many students wore shorts

The area of a 25-inch tv screen is 300 square inches. the area of a 40-inch tv screen is 768 square inches. the are of the smaller screen is what percent of the area of the larger screen?

He concluded that a heavier object dropped from the same height as a lighter object will land

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?