1. Which of the following expressions can be used to identify the instantaneous rate of change of the functionf(x)=x³-4x at the point x=6
2. A particle moves along a line so that its position at any timet 0 is given by the function s(t)=1/2t²-4t+8 where s is measured in feet and t is measured in seconds. Find the instantaneous velocity when t=10
3. What is the tangent lines to the graph y=4/x at x=-1
4. Suppose a ball is thrown straight upward from a height of 4 feet. The initial velocity of the ball is 35 feet per second. Write the equation of the position function and use it to find the velocity of the ball at time 0.75 seconds.