The circle C has the equation x² + y^2 +6x + 10y - 11 = 0. The point (3, k) lies on the circle. Find the real values of k.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Suppose that 15 inches of wire cost 60 cents. at the same rate, how much (in cents) will 12 inches of wire cost