Suppose the Equations $\frac{d y}{d t}=4 y-x y$ And $\frac{d x}{d t}=x-x y$

question 66

Multiple Choice

Suppose the equations $\frac{d y}{d t}=4 y-x y$ and $\frac{d x}{d t}=x-x y$ describe the rates of growth of two interacting species, where x is the number of species A, measured in thousands, and y is the number of species B, measured in thousands.Which of the following describes the nature of the interaction between these two species?

• A)Species A would be better off without species B, but species B needs species A in order to survive.
• B)Species B would be better off without species A, but species A needs species B in order to survive.
• C)The two populations depend on each other; each would not survive without the other.
• D)The two populations are competitors; each suffers in the presence of the other.

---

Definitions:

Perpetual Inventory Method

The perpetual inventory method is a system of accounting for inventory that continuously updates the quantity and value of inventory items after every transaction.

Journalize

The act of recording transactions in the accounting journals as part of the bookkeeping process.

Terms 2/10, N/30

Payment terms indicating a 2% discount if paid within 10 days, otherwise the net amount (total invoice) is due within 30 days.

Debit Memorandum

A document issued by a buyer to a seller indicating a debit made to the seller's account, often due to returned goods or errors in the invoice.