exam Maths Puzzle Numerical Ability

solve the solution

y=3^(2x+1)
y=9^(4-2x)

do you make the powers = one another for 2x+1=4-2x

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exam Other Question

A rectangular pool is surrounded by a walk 4 meters wide. The pool is 6 meters longer than its width. If the total area is 576 square meters more than the area of the pool, find the dimensions of the pool. how to prove that (1/2)*(3/4)*(5/6)*(7/8)*(9/10)*...(99/100)>=1/10