For 0≤t≤13, an object travels along an elliptical path given by the parametric equations x=3cost and y=4sint. At the point where t=13, the object leaves the path and travels along the line tangent to the path at that point. What is the slope of the line on which the object travels?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.