book Maths Puzzle Numerical Ability

square root x+4+3 using graphing utility

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book Other Question

Which point will be the result, when we start at the origin and move 15 units to the left and then move 11 units up? Write your answer as an ordered pair.
If the total charge including 6.50% tax is 17,883.77, then how much is the original charge before the 6.50% tax? It seems that whenever I try to work this out, I end up with 6.50%