MAT1005 Mathematics for Business and Economics (Semester 1, 2022-23) ASSIGNMENT 4
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MAT1005 Mathematics for Business and Economics
(Semester 1, 2022-23)
ASSIGNMENT 4
Deadline: December 5, 2022 (Monday) noon
Topics 4 Differentiation and Partial Differentiation
(1)
Given the following function
f(X) = X 5 − 3X4 + ln (4X) + 2
(a) Show that f(X) has a root over the interval [ 1, 2] .
(b) Find an approximate value of the root in the interval [1, 2], to 4 decimal places accuracy, by using the Newton method. (You are required to show your workings)
(2)
Delilah Office Supply Limited (Delilah) manufactures and sells paper shredders to its customers. The price-demand equation for these shredders is
y = 60 − 0.04Q , where y is the price per shredder and Q is the number of sold
shredders
Delilah could produce at most 1,000 shredders. The cost of manufacturing Q paper shredders by Delilah is
C (Q) = 8,000 + 10Q
(a) Find an expression for the profit function in terms of Q, i.e. P (Q).
(b) Find the derivative P# (Q).
(c) By using (b), what is the company’s maximum profit? What should the company charge for each shredder, and how many shredders should be sold?
(d) The government decided to tax additional $4 for each sold shredder. Considering this additional expense, what is the company’s maximum profit? What should the company charge for each shredder, and how many shredders should be sold?
(3)
For the following function,
f(X, y) = X 2 + 4y3 − 6Xy − 2
(a) Find all critical point(s).
(b) For each critical point, determine, by the second derivative test, whether it is a local maximum, a local minimum, a saddle point, or whether the test gives no information.
Topics 5 Integration
(4)
Find each of the following indefinite/ definite integrals
(a) ∫ 4v3 dv
(b) ∫ = + > dw
(c) ∫ @Ady
(d) (3z − 2)4 dz
(5)
The marginal revenue, P, (x), for selling x units of a product is given by + 10
Find the revenue function.
(6)
Find the area of the shaded region
y = x(x − 4)2
y = x
2022-12-05