Step-by-step explanation: you would divide the numerator by the denominator; you would divide 7 by 9 and get 0.77 then just add the negative sign in front of the zero.
First you add all the numbers together. So you add 82+93+75+89 to get 339. Once you get that, you divide it by the amount of numbers there are. In this case, it's 4. 339 divided by 4 is 84.75.
