exam Maths Puzzle Numerical Ability

Find the length, slope, midpoint and equation to the line
PQ.

P (7, 11)
Q(-2,4)

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exam Other Question

I need to find three sides of a right triangle by using the pythagorean theorem. The info I have is: leg1: x, leg2: 40-(2x+2), hypotenuse: x+2. Is the following trinomial a perfect square?
x^2 - 14x + 49