2 3/5 or 2 6/10 is the answer
1. 15*15= 225
2. 8*8= 64
3. 225+64= 289
4 . 17*17=289
"n factorial" is the product of such numbers.
D.

Where (h, k) is the center of the circle and the radius is squared.
Given the function s(t) = -9 -3t, differentiating the function gives the instantaneous velocity.
s’(t) = -3
This means that the velocity is not a function of time and is therefore constant. The velocity at t = 8 ( or any time for that matter) is -3 units/time.