exam Maths Puzzle Numerical Ability

Find the distance between each pair of points.
A(4,-3) and B(-4,3)

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exam Other Question

an orchard operator must dilute 11 quarts of 60% insecticide solution by adding water. How many quarts of water should be added to get a mixture that is 2% insecticide? Graph f(x)=-x-2

I am not sure how to come to the solution in order to graph it.