In Problems 19 - 24 , perform the operations that are defined, given the following matrices: A = 2 − 2 1 0 3 2 B = − 1 2 3 C = 2 1 3 D = 3 − 2 1 − 1 1 2 E = 3 − 4 − 1 0 E + D A
In Problems 19 - 24 , perform the operations that are defined, given the following matrices: A = 2 − 2 1 0 3 2 B = − 1 2 3 C = 2 1 3 D = 3 − 2 1 − 1 1 2 E = 3 − 4 − 1 0 E + D A
Solution Summary: The author calculates the matrix, E+DA, by performing the defined operations for the following matrices.
Let y(t) represent your retirement account balance, in dollars, after t years. Each year the account earns
7% interest, and you deposit 8% of your annual income. Your current annual income is $34000, but it is
growing at a continuous rate of 2% per year.
Write the differential equation modeling this situation.
dy
dt
8:37
▬▬▬▬▬▬▬▬▬
Ο
Graph of f
The figure shows the graph of a periodic function
f in the xy-plane. What is the frequency of f?
0.5
B
2
C
3
D
8
3 of 6
^
Oli
Back
Next
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2. The growth of bacteria in food products makes it necessary to time-date some products (such as milk) so that
they will be sold and consumed before the bacteria count is too high. Suppose for a certain product that the number
of bacteria present is given by
f(t)=5000.1
Under certain storage conditions, where t is time in days after packing of the product and the value of f(t) is in
millions.
The solution to word problems should always be given in a complete sentence, with appropriate units, in the
context of the problem.
(a) If the product cannot be safely eaten after the bacteria count reaches 3000 million, how long will this take?
(b) If t=0 corresponds to January 1, what date should be placed on the product?
Chapter 4 Solutions
Finite Mathematics for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
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