If the area of a circle is 31.36pi, then what is its radius?
**i have been thinking about this for an hour, but i'm not sure if my answer is correct?

Find the power series expantion of f(z)=log(4=3z) at the point z=-1

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Anyone know? is appreciated! will mark brainliest if correct!