exam Maths Puzzle Numerical Ability

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

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exam Other Question
This problem is not in the book.
15/x - 15/x+2 =2 Can you help me solve this? Thanks Rhee I am having problems figuring these out could you help please
plot the graph
f(x)=(1/2)^x
f(x)=log2^x