How to find the equation of a circle given a center and radius

Select the correct answer and solve for y

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

Find the exact value of cos(arcsin( one fourth for full credit, explain your reasoning. (2 points)