Describe a way to calculate 304-81 mentally by using reasoning other that the common subtraction algorithm. then write a coherent sequence of equations that correspond to your reasoning

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^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