exam Maths Puzzle Numerical Ability

I need help solving the exponential equation

e 2-x=12

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exam Other Question

Give the center of the circle with equation x^x + 2x + y^y + 22 +0 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