exam Maths Puzzle Numerical Ability

This is not algebra but here is my question......hoping to get an answer.

How energy from the sun becomes transformed into energy to power the human body ?

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exam Other Question

Hello out there,I need some help with some problems,the first one is,Evaluate:(a+b)^2.The next one is,Multiply:(a-2b)(a+2b).The next one is,Multiply:(g-6h)(g-6h).And the last one is,Multiply:x(x+1)(x-1).Thanks to whoever can help. I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help