First Midterm Exam, M403K, Fall 2000

1. Consider the function tex2html_wrap_inline38

a) Find f'(x).

b) Find the slope of the line tangent to the curve y=f(x) at x=0.

c) Find the equation of this tangent line.

d) Use this tangent line to approximate f(0.01).

2. From the following table, estimate f'(1). Indicate clearly how you obtain your answer:

tabular6

3. Evaluate the following limits, if they exist (or write DNE if they do not).

a) tex2html_wrap_inline54

b) tex2html_wrap_inline56

c) tex2html_wrap_inline58

d) tex2html_wrap_inline60

4. Take the derivatives of the following functions with respect to x. You do not need to simplify your answers:

a) tex2html_wrap_inline64

b) tex2html_wrap_inline66

c) tex2html_wrap_inline68

d) tex2html_wrap_inline70

5. New England Widget Technologies (NEWT) makes expensive high-tech widgets. Their marketing department has determined that the demand function is x = 4000 - 2p, where x is the number of widgets sold and p is the price. Their cost function is C(x)= 200,000 + 1000x.

a) Find the price p(x) and the revenue R(x) as a function of x.

b) Compute the marginal cost, marginal revenue and marginal profit as a function of x.

c) The company has a current production level of x=1500. To increase revenue, should the company increase or decrease production? [Note: you do not need to compute the optimal level of production. You just need to say whether it is higher or lower than 1500.]

c) The company has a current production level of x=1500. To increase profit, should the company increase or decrease production?