Please solve these questions

3. Practice with the limit definition of the derivative. In the first three problems you are being asked only to write the definition out, but you need to take care that in each case the definition is correctly expressed. (a) Suppose that u is a differentiable function of x. Write out the limit definition of the derivative u'(x). (b) Suppose that v is a differentiable function of t. Write out the limit definition of the derivative v' (t). (c) Suppose that f is a differentiable function of r. Write out the limit definition of f'(a), the derivative of f for the value x = a.P Chrome - Take a Test - Samuel Michel https://www.mathxl.com/Student/PlayerTest.aspx?testld=145009302&c Test: Final Exam This Question: 1 pt Water is cheap and brings a Diamonds are expensive and bring a O A. large deadweight loss, small deadweight loss O B. large consumer surplus; small consumer surplus OC. small deadweight loss; large deadweight loss .O D. small consumer surplus; large consumer surplus