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Suppose that the temperature z over the plane is given by z = f(x,y), where f(x, y) = x2y - y3.
a. Show that the only critical point is at (0,0).
Use the factorization f(x,y) = y (x2 - y2) to conclude that this point is a saddle point.
b. Now suppose that we are restricted to the unit disc x2 + y2
1. Find the points on the boundary where f attains its absolute max and min. What is the absolute max and min of f?
A Wal Mart can sell 200 TV's per month at $300 each, but market research has determined that it can sell one more unit per month for each $2 reduction in the price of a set. At what price would revenue be maximized?
a steep mountain is inclined 79 degrees to the horizontal and rises 3100 ft. above the surrounding plain. a cable car is to be installed from a point 900ft from the base of the mountain. find the shortest length of cable needed?
At what rate is the base of the triangle changing when the altitude is 11.5 centimeters and the area is 86 square centimeters?
Calculate the mean, variance, and standard deviation of this distribution.
Approximate the value of log2 9. Explain how to figure out 3
a total of 325 tickets were sold for the school concert and 36 percent of these were sold to students. how many tickets were sold to students
If a manager sets the reorder point at 30, determine the probability of a stock-out on any given order cycle. Determine the number of times the manager should expect a stock-out during the year if this reorder point were used.
(a) If a sample has a mass of 200 mg find a formula for the mass that remains after t days. (b) Find the mass after 100 days. (c) When will the mass be reduced to 10 mg?
Coffee is being poured into the mug at a constant rate. Sketch a graph of the depth of the coffee in the mug as a function of time. Account for the shape of the graph in terms of concavity.
A particular hybrid car travels approximately 156 miles on 4 gallons of gas. Find the amount of gas required for a 702 mile trip.
Kelly Fisher has a total of $33,000 invested in two municipal bonds that have yields of 8% and 10% interest per year, respectively. If the interest Kelly receives from the bonds in a year is $2920, how much does she have invested in each bond?
Find the first four terms in each of two linearly independent solutions of the given differential equation (solve by means of a power series about the given point x0 ).
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