exam Maths Puzzle Numerical Ability

Hi, I am hoping someone can help me with this equation:

Let f(x) = 2x+5 and find a) f^-1 and b) 1/f(x)

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exam Other Question

How do I solve by using two equations and two variables?

The sum of the digits of a two-digit number is 12. If 15 is added to the number, the result is 6 times the units digit. Find the number. Not sure if this is right

7. (2 pts)
Two balls are to be selected without replacement from a bag containing one red, one blue, one green, one yellow, and one black ball. How many points are there in the sample space? 5*4 = 20 ??