Hello, I'm looking for help with practice questions 1 and 2. Is it possible to get explanations for the simplification/ relationships between the exponents during derivatives? I find that my biggest problem area is cancelation/ simplifying at the end of a problem

1) The point P(2, -) lies on the graph of y = 2. If Q denotes the point (1, 2), find the simplified form of the slope of the line joining P and Q when r = 3. 2) In each case, evaluate the limit. If the limit is not a number, write -oo, oo, or DNE, and justify your answer. x2- 1 u* + 9 t +8 (a) lim -8x + 7 (b) lim 4 +3 22- 3 (c) lim 3 1-+4 t 2 - 4t t - 4 er (d) lim (e) lim q2 cos 1 0- er - 1 9-20