Assignment 3, Math for Economics I (28 points)
Write neat solutions for the problems below. Show all your work. If you only write the answer with no work, you will
not be given any credit. Please do not forget to:
Write your name and recitation section n

Assignment 2, Math for Economics I (28 points)
Write neat solutions for the problems below. Show all your work. If you only write the answer with no work, you will
not be given any credit. For especially painful computations, you may use your calculator,

Assignment 6, Math for Economics I (28 points)
Due Friday, Oct 30, in recitation
Write neat solutions for the problems below. Show all your work. If you only write the answer with no work, you will
not be given any credit. Please do not forget to:
Write

Review for Local Extrema Analysis for Functions of Multiple Variables
1. Find the critical points and classify them as local maxima, local minima, saddle points, or none of these.
(a) f (x, y) = x2 2xy + 3y 2 8y
(b) f (x, y) = x2 y + 2y 2 2xy + 6
(c) f (x

Math for Economics 1, Quiz 1 - Section 5 (10 pts)
New York University
1. (5 pts) The demand equation for a product is given by q = 15 p, and the supply equation is given by q = p 7,
where the price is in dollars.
(a) (3 points) Find the equilibrium price

Quiz 2, Math for Economics 1, Section X (Solution)(10 pts)
New York University
1. (a) (2 pts) Loservilles population is currently 1000, but its population declines at a rate of 2% annually. On the
other hand, Winnervilles population is currently 500, but

Assignment 7, Math for Economics I (28 points)
Write neat solutions for the problems below. Show all your work. If you only write the answer with no work, you will
not be given any credit. Please do not forget to:
Write your name and recitation section n

Quiz 3, Math for Economics 1, Solution (10 pts)
New York University
1. A function f (x) is graphed below.
(a) (4 pts) On the same graph, sketch its derivative f 0 (x).
(b) (2 pts) Let g(x) = x2 4x find the derivative of xf (x) g(x) at x = 5.
Sol: (xf (x)g

Math for Econ I- Practice Problems
New York University
1. Supply and demand
1. In a California town, the monthly charge for waste collection is $8 for 32 gallons of waste and $12.32 for 68 gallons
of waste.
(a) Find a linear formula for the cost, C, of wa