Please help! Math problem from Khan Academy. To see the problem, look at the picture I attached.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0