The equation of a circle with center at (h,k) is
(x-h)^2+(y-k)^2=radius^2
given
(x-(-1))^2+(y-3)^2=9
center is (-1,3)
first option
we are given to simplify

Open the bracket and write the like terms together

when the bases are same then the exponents gets added

Answer:
I believe that the answer is 'n=8'.
(-25) + 10 + (-5) = -20 feet is his current position. To reach zero, he should add 20 feet to his altitude.