Given the system of equations presented here:

4x + y = 4
2x + 7y = 28

which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated?

multiply the second equation by −1 to get −2x − 7y = −28
multiply the second equation by −4 to get −8x − 28y = −112
multiply the first equation by −7 to get −28x − 7y = −28
multiply the first equation by −2 to get −8x − 2y = −8

Factor completely. x^8 - 1/81 a) (x^4 + 1/9)(x^2 + 1/3)(x^2 - 1/3) b) (x^4 - 1/9)(x^2 + 1/3)(x^2 - 1/3) c) (x^4 + 1/9)(x^2 - 1/3)2

You call the pizza store and find out that eachpizza has 12 slices. you expect 16 people tocome, and you estimate each person will eat 3slices. how many pizzas should you order

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