Is it a or d ?

How many zeros does the function f(x)=4x3-x2+1 have

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality