book Maths Puzzle Numerical Ability

I have points A (5,7) and B (-2, 3).
What is the equation to the line connecting these points?
What is the distance between these two points?
What is their mid-point?
What is

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book Other Question

What is the equation of a circle with center (0,1) and a radius 2 units?

Thanks Okay, I lied, I have one more:
Could someone please help me?
I really need help to reduce this problem into lowest terms by performing the indicated operation:
5/3a-9 -3/2a + 4/