exam Maths Puzzle Numerical Ability

It takes Tom 2 days to paint a house and it takes Leah 4 days and it takes Lisa 6 days. How long will it take to paint the house together?
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I need help solving this problem
y=2/3x
a)6,6
b)-9,-6
c)0,0
d)-1,2/3 If F(x)= 3X to the 3rd power -6X to the 2nd power - x + 7, what is the value of f(2) + f(-2)?

This question is multiple choice, it is either A. -34, B. 0, C. 2, D. 7, E. 14