Can someone explain how to do this?

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Daryl factors the polynomial p(x)=x3+x2−26x+24 to rewrite it as p(x)=(x+6)(x−4)(x−1). which equations must be true? there may be more than one correct answer. select all correct answers. p(1)=0 p(−4)=0 p(−1)=0 p(6)=0 p(4)=0 p(−6)=0