A ball with mass 0.15kg is thrown upwardswith initial velocity 20 m/sec from the roof of a building 30mhigh. There is a force due to air resistance of v^2 / 1325 .where the velocity is measured in m/sec. (a) Find max height above ground ball reaches. (b) Find the time that the ball hits the ground.

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

$\frac{1}{\sec <!--\; \; -->(x)}$ in derivative?

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