exam Maths Puzzle Numerical Ability

Please help me solve this.

Find the center and radius of the circle given by x^2+(y+4)^2=25.

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exam Other Question

Hi,
Please help me with the follwoing problem: Solve 0=1-sin(2*pi*t)for 0 < t < 2 (both are or equal to). I don't even have the vaguest idea on how to solve this problem. Any hel Please help me with this I cannot seem to figure out how to graph this function.
Graph: f(x) = -2x + 2

Thanks for any help you can give.