Answer:
Inequality: 4g + 70 < 90
Explanation:
Given that:
Flat cost per month = $70
Cost per gigabyte = $4
Budget amount = under $90
As she wants to keep the budget under 90, then we will use less than sign to form the inequality.
Let,
g be the number of gigabytes.
4g + 70 < 90
Hence,
Inequality: 4g + 70 < 90