exam Maths Puzzle Numerical Ability

Please help me solve these equations:

For h(x) = (x/2) +5, find [h(4+a) -h(4)] / a

Using f(x) and g(x) above, find f [(g(a)]



THANKS!

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How do I start to multiply this rational expression z^2 - 10z+21/z^2 - 13 + 36 divided by z^2 -11z + 24/z^2 - 9z + 14 An airplane traveled 2660 miles in 3.5 hours with a tail wind. The return trip took 3.8 hours with a head wind. What was the speed of the airplane in still air? What was the speed of the wind? Solve by using a system oif equations.