exam Maths Puzzle Numerical Ability

I tried using logarithms, but I was a bit confused??? Help?

4^x = (5^x + 2)^.5

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exam Other Question

how many liters of a 45% salt solution should be mixed with 9 liters of a 35% salt solution to make a solution that is 36% salt? round to the nearest hundredth Find the distance between (-9,3)and(-1,-5)