exam Maths Puzzle Numerical Ability

20 simplify: 24s/3s

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exam Other Question

Multiply, using the vertical method.

(2r - 3s)(4r^2 + 6rs + 9s^2)
I am having problems with this solution:

Solve for x: log(x - 5) + log 4 = 2

Please help. Thanks
-Ryan