exam Maths Puzzle Numerical Ability

it says to rewrite the expressions with positive exponents

heres the problem

51) x to the -5 power

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exam Other Question

For a sample of size n-100, proportion p-0.6, and at a 95% confidence level, What is the upper bound of the proportion? SQUARING AND SUBSTITUTION

4M+ 8SQUARE ROOT M -5=0

4M PLUS 8 SQUARE ROOT SIGN WITH M UNDER IT -5=0
solve

thanks