book Maths Puzzle Numerical Ability

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A store buys TVs from a factory for $87.80 each. The store normally sells one of these TVs for 225 percent of the factory cost, but a store coupon gives 25 percent o

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inverse of g(x)=3^x+1
i get to the point of were i have the equation

x-1=3^y but i dont know how to get the y isolated on one side
Find both the complement and the supplement of each angle measure of 40