13 x 6 = 78 it cant be multiplied anymore so it can go into 80 about 6 times.
For the first one, you're answer would be AC. since C is also a right angle, and angle A is hypnotenuse to C
An inverse function is a function that reverses another function, so we have a function called:

Then, the inverse function will be as follows:

Given that

, we need to isolate x in terms of y:

∴

So:

and

therefore, exchanging variables x and y:

and


and

Which are the figures shown below.