Companies A and B provide housekeeping services. Company A charges 28$ for the first hour, and 10$ for every subsequent half hour. Company B charges 20$ for the first hour, and 12$ for every subsequent half hour. After how many hours will Company A be cheaper than Company B?

Given abcd ac=38 and ae=3x+4 find the value of x

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

What number is 7 units left of -15?