The distances (y), in miles, of two cars from their starting points at certain times (x), in hours, are shown by the equations below:

car a:
y = 52x + 15

car b:
y = 46x + 63

after how many hours will the two cars be at the same distance from their starting point and what will that distance be?

8 hours, 510 miles
8 hours, 431 miles
7 hours, 510 miles
7 hours, 431 miles

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