4. Compute the limits: 2F671 a) lim x1 x-1 b) lim x-2x+1 *1 x+x-2 c) lim 3 1 x-xx+1 x-1 19 Application 18 5. Determine f (a), the left sided limits, the right side limits and the limits as x approaches each of the limit values indicated in the diagram (*on board) Communication 6. What is a derivative? /2 7. How would you find out the slope of the curve of y = -x3 + 4x + 3x when x = 1? How could you find out if the curve will ever have a slope of 1. /3 (marks are given for the explanation)