Question

At a convenience store, bottles of water cost $1.20 each. The function f(x)=1.2x gives the cost of buying x bottles Give a reasonable domain and range for the function in this context.

Answer 1

Step 1

Given;

`f(x)=1.2x`

Required; To find the domain and the range.

Step 2

Domain

All the values that go into a function.

`x\text{ represents the number of bottles of water}`
`The\text{ number can start from 0 and go to }\infty`

The domain will be;

`[0,\infty)`

The range

The output values are called the range.

The range cannot be negative therefore it is;

`[0,\infty)`