exam Maths Puzzle Numerical Ability

What is the center and the radius of a circle with equation (x+1)^2+(y+3)^2=9/4?

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exam Other Question

I am trying to solve problem 10 on page 419. I do not understand how to find the base, when the area is already given in a triangle If x+p is a factor of ax*+bx+3, show that p(b-ap)=3.