exam Maths Puzzle Numerical Ability

i need to find the center, and radius of this circle

x^2+(y-8)^2 = 81

please help

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exam Other Question

I would like help in finding this equation in standard form, the directrix, the p, the focus and what y would equal. I would also like a graph of the parabola to see what it would True or False.

the following matrices can be multiplied.

[2 -2] [0 1]
[3 -3] [9 -1]
[0 1]