Any closed figure formed by a set of segments is a polygon. true or false?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Consider circle c with angle acb measuring 3/4 radians.if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.