exam Maths Puzzle Numerical Ability

What is the radius of the circle 2x^2+2y^2-8x+16y-32=0? I think the am=nswer is 6?????

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exam Other Question

find the area of a rectangle which shows the answer as a polynomial in descending powers of x. length: 3x+9, width: x-1 1.)Solve the system.
4x + 3y = 11
3x - 2y= 4
x=? y=?

2.)Jennifer has collected $4.50 in nickels and dimes. If she has 55 coins, how many of each kind of coin does she have?