Question

A supermarket sells string beans for $2 a pound. The function A (n) = 2n relates the total of string beans to the number of pounds, n, bought. Find the domain if the supermarket sells up to 4 lbs of string beans.

Answer 1

The function we have is:

`A(n)=2n`

Where A is the total of string beans, and n is the number of pounds bought.

The domain of a function is the interval of possible values for the independent variable. In this case the independent variable is n (the number of pounds).

Since we are told that the supermarket sells up to 4 pounds, that is the limit for n, thus n can take values from 0 (0 pound bought) to 4 (4 pounds bought).

The domain is:

`\lbrack0,4\rbrack`

Answer: Domain = [0,4]