Find the equation of the tangent line to a? + y? = 9 at the point (2, v5) O y = 5+ 2 (x - 5) V3 Oy = -V5 - (a - 2) O y = V5 - (x – 2) O y = V5 + (x- 2)

verify by differentiation

Evaluate y' at the point (2,2) 5x3y - 2x2 = 72

An object is moving along a straight path that runs north and south .Its velocity, in feet per minute , is given by  v(t) 18-8t+3t^2, where north is the positive direction. After 10 minutes, is the object north of its starting position or south?