exam Maths Puzzle Numerical Ability

Find the value of r so that the line through (-4,3) and (r, -3) has a slope of 2/3.

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exam Other Question

Multiply the fraction:

2x^2-x-3 3x^2-11x-20
-------- * -----------
3x^2+7x+4 4x^2-9

I am completely lost on this one....to many numbers or letters I am not sure. Thank you for the wonderful help :-)
Factor completely:
7x^2 - 35x + 28