I multiplied $15 by 230% and then added my answer(which was 34.5) because subtracting it wasn't an option and got $49.50
Answer:

Step-by-step explanation:
Here,
f(x) = y

or , swapping x with y

now to solve for y we get

now we put f inverse x instead of y

I am done.
Answer:
16
Step-by-step explanation
6 = x/4 + 2
subtract 2 from both sides
4 = x/ 4
since its dividing x and 4 you need to multiply 4 on both sides
16 = x
Has to be B other I don't know
I think the answer is Obtuse