Take a picture of your Handwritten answers and upload it below. Do not rewrite the questions, just the answers. 1. a) Write an expression for a Riemann sum of a Jnetion at) . Explain the meaning of the notation that you use. b) If f(.'.B) takes both positive and negative values, what is the geometric interpretation of a Riemann sum? Illustrate with a diagram. 2. a) State both parts of the Fundamental Theorem of Calculus. b) State the Net Change Theorem. 3. a) What is the geometric interpretation of I; / f(ac)da: if f(:13) takes on both positive and negative values? Illustrate with a diagram. b) Explain the meaning of the indenite integral fwldw (3) State the Substitution Rule and explain how does it make the integration process easier