exam Maths Puzzle Numerical Ability

Find the value of x: log x 25 over 9 = 2

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exam Other Question

simplify

(a^-1 + b^-2)^-1
Please help me solve this problem:

5-2*2+8*5-2=28

I was asked to add parenthesis where it makes the problem equal 28. I could not figure it out, please help.