1. find the equation of the plane passing through the points

p(10,10,9)

q(6,8,-1)

r(2,4,1)

2. arc length 9y^2 = 4x^3 from the origin to (3,2?3)

3. determine los puntos sobre la curva donde la tangente es horizontal: r=22cos ?

4. determine by the test of reason if the series is convergent.