exam Maths Puzzle Numerical Ability

Please help me. I am having problem with this question.

1. If the diameter of a circle is 1.3 * (10)^-12 meters, then wha is the radius?

Thank you kindly.

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exam Other Question

I am having a difficult time with functions.
Can you show me how to solve:
1) If f(x)=x2 and g(x)=x1/2, what is f(g(x))?

2) If f(x)= 2x+3 and g(x) = 3-5x, what is simplify:

4x^8 + 10x^4 + 6x^3 / 2x^6

thanks