exam Maths Puzzle Numerical Ability

Find the mean.-5, -2, 2, 4, 14, 17

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exam Other Question

find the slope if it exists. There is a pic of a box with tiny squares inside the box and a line with (-5, 3) and (5, -2) do i just subtract the -5 and -2 and add the other 2? is x+3 a factor of -2x^3+x^2-63?