Find the solution of the initial-value problem M ·   x¨1(t) x¨2(t)   + K ·   x1(t) x2(t)   =   0 0   , where x1(0) = 1, x2(0) = 2, dx1 dt (0) = dx2 dt (0) = 0 and M =   1 2 2 2   , K =   4 8 8 2   . Is this periodic?

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)

Angela took a general public aptitude test and scored in the 88th percentile for aptitude in accounting. what percentage of the scores were at or below her score?

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