exam Maths Puzzle Numerical Ability

simplify

(6^(x-5)) / (6^(3-x))

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exam Other Question

To Whomever can assist, thank you!

If a box of candy costs a retailer $2.50, and he wants to make a profit of 50% based on the selling price, what price should he charge for the candy? My question is: Why is line x=4 a vertical line?

Thanks.