To determine the number of gigabytes \( g \) that Paisley can use while keeping her bill under $75 per month, we can set up the following inequality based on her cell phone plan:
The total cost is comprised of the flat fee plus the cost per gigabyte:
\[ \text{Total cost} = 60 + 3g \]
We want this total cost to be less than or equal to $75:
\[ 60 + 3g < 75 \]
Now, we will solve the inequality:
- Subtract 60 from both sides:
\[ 3g < 75 - 60 \] \[ 3g < 15 \]
- Divide both sides by 3:
\[ g < \frac{15}{3} \] \[ g < 5 \]
Thus, the inequality is:
\[ g < 5 \]
This means that Paisley can use up to 4 gigabytes of data (since she cannot use a fractional part and has to stay under 5) while keeping her bill under $75.