3 2/3 For #1
2.5 for #2
4.125 for #3
Answer:
To find f-¹(x) of f(x) equate f(x) to y
That's
f(x) = y
So we have

Next interchange the variables that's x becomes y and y becomes x
That's

Next make y the subject
Cross multiply
We have
4y - 7 = 10x
Move -7 to the right side of the equation
4y = 10x + 7
Divide both sides by 4
We have the final answer as

So

Hope this helps you
I think it’s A sorry if it’s wrong!
f(x) cannot be 0 or less than zero, but can approach+ infinity
Answer is (0, ∞)