Please answer number 3 and 4 only. Determine if the given function is continuous and differentiable at the indicated values of x. Please use the "limit of a difference quotient" in number 3. Please provide a solution or explanation. Thank you!

Determine if the given function is continuous and differentiable at the indicated values of x. Write the letter of your answer on a separate sheet of paper. 1. f(x) = 3x + 10 A. x = 5 B. x= 0 2. f(x) = x2 - 5x +6 A. x= 1 B. x = -3 3. f(x) = 4x+5 9-3x A. x= -1 B. x= 0 C. x = 3 x