exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points:(3, 9), (3, -5)

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i need help with the following problem(they are fractions being multiplied and divided):

(2x^2-7x+6)over(x^2-4) multiply by (x^3+4x^2-4x-16)over(x^2-8x+16)divided by (4x^2-9) ov The edges of three cubes are consecutive odd integers. If the cubes are stacked as shown the total exposed surface area is 381 cm2. Find the lengths of the sides of the cubes.

i need an equation for this pls..