Hot air balloons generally descend at a rate of 200 to 400 feet per minute. Four balloons descend 200 feet per minute for 9 minutes. Find the total change in altitude for all 4 balloons

correct answer:

i^31 = -i

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

the answer is a if my teacher taught me correct