Which of the following figures appears to have at least one collapsed or indented side(s)?
a. circle
b. convex polygon
c. parallelogram
d. concave polygon

Is this a polynomial function? i need to know asap

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g