exam Maths Puzzle Numerical Ability

please help me with this problem:
for the following inequality:x-y<-4
list three ordered pair solutions for the boundary of this inequality

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exam Other Question

A professor grades homeowrk by randomly checking 7 of the 20 problems assigned. in how many different ways can this be done? Multiply:
(8sqrt[6] + 3sqrt[2])(4sqrt[6] – 5sqrt[2])