exam Maths Puzzle Numerical Ability

Which of the ordered pairs
(3, 1), (0, -4), (-4, 0), (-3, -7)are solutions for the equation
x - y = 4?

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exam Other Question

A. Is the following binomial a difference of squares?
9a^2 - 8b^2

B. If one-half a number is subtracted from five-sixths of the number, the difference is 6. Find the number A course for cross-country skiing is regulated so that the slpoe of any hill cannot be greater than 0.33. Suppose a hill rises 60 meters over a horizontal distance of 250 meters. Does the hill meet the requirement? Show all work.