If you multiply 9 x 3
=27
And multiplying the 10's means that the exponents need to be added
So the answer would be...
27 x 10^8
To find the inverse of a function, firt we let

Now we switch x and y and solve for y .

Adding 25 to both sides

Now we need to get rid of square and for that we take square root on both sides. That is

Therefore, inverse is

F(18)=(1,2,3,6,9,10) f(27) =(1,3,9,27) GCF =9 GCF =250, numbers are 2 (850) and 3 (850) or 1700 and 2550