exam Maths Puzzle Numerical Ability

The question is: Find the missing angle measure, when the radius is 6 and the arc length is 3pi/2

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exam Other Question

Instructions: Perform the indicated operations.

What is the solution for (2a-3y)(2a+3y)
Solve these simultaneous equations:

2log(2)y = log(4)3 + log(2)x

3^y = 9^x

given that x and y are positive

I have no idea how to even begin to solve this