exam Maths Puzzle Numerical Ability

I am having problems figuring these out could you help please
plot the graph
f(x)=(1/2)^x
f(x)=log2^x

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exam Other Question

A person is at the top of a poplar tree that is 60 feet high. A lion is on the ground at the foot of the tree. The teacher descents 1/2 ft each day but at night climbs back up 1/6 its a continued fraction problem, i have to write it in p/q form, reduced to the lowest term and i have never done this type of problem before