Which of the following are terms in the sum of the given polynomials? 3x^2,-2x^2y, 2xy^2, 4y^2, xy^2, -y^2,2x^2y
Select all that apply

3
3xy ^2
4x ^22
3x ^2
3y ^2

What is the base of 1/9 to the power of 2

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

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