book Maths Puzzle Numerical Ability

Simplify.
a^5 * a^ 3 = a^8
Cheers,
Stan H.

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book Other Question

I have 5 units out of 36 in compliance with a regulation. How do I figure out what percentage that is?

36 divided by 5 = 7.2%
5 x 100 divided by 36 = 13.8

Which is the corre
Solve using the square root property:
5x^2=100
5(2*51/2)

Is this correct?