Linus has a demand function q = 10 - 2p

a. What is the price elasticity of demand when the price is 3?

b. At what price is the elasticity of demand equal to -1?

c. Suppose that his demand function takes the general form q = a - bp. Write down an algebraic expression for his elasticity of demand at an arbitrary price p.

d. How do you write an expression for total revenue as a function of the price.Please explain.