Please solve idk how to do this.

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.