Cis the circumcenter of triangle pqr. pc=3x-7 rc=5x-15 & qc= 51-x what does pc equal?

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

How is the number of vertices for a prism related to the name of the prism

What is the explicit rule for the sequence in simplified form? −1,−4,−7,−10,−13… an=4−5n an=−4−3n an=2−3n an=−6−5n