exam Maths Puzzle Numerical Ability

Evaluate 8.3 to the power of 5

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exam Other Question

find a counterexample, that is, find real values for which the statement is false.
a/b=b/a Here is a problem I have put through a few times, but getting difference answers and a bit confused. Hope someone can show me how to work it out.

I need to solve for x and show proof:

-4 (2x -3) = 8x + 5

Thanks,
Sher