Solve for the specified variable:
18. A = nr2 for r
v2
19. P = — for v
R

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

What is the value of x? enter your answer in the box.

Suppose that the function f is defined. , for all real numbers, as follows. _ \ 1/4x² -4 if x≠ -2 f(x)=< /_-1 if x=-2 find f(-5), f(-2), and f(4)