8/12 because 3/4 is equal to 9/12 and there was 1/12 left so 8/12
Super easy. Take the function, and replace X with Y and Y with X. For example, if Y=12/x, then the inverse would be X=12/Y. Now solve for Y, so XY=12, the Y=12/x.
12 ^3 and 11^3 haven't got the same base so the rules of exponents do not apply.
Bases have to be the same:- for example 12^3 * 12*3 = 12 ^(3+3) = 12^6
Working is a bit of a mess, but vertically she's correct, but she's incorrect horizontally