Answer:
Katelyn needs to mow 3 lawns to have enough money to buy the skateboard.
What are inequalities and their types?
Inequality is a relation that compares two numbers or other mathematical expressions in an unequal way.
The symbol a < b indicates that a is smaller than b.
When a > b is used, it indicates that a is bigger than b.
a is less than or equal to b when a notation like a ≤ b.
a is bigger or equal value of an is indicated by the notation a ≥ b.
Let, 'x' be the no. of lawns she has to mow.
Given, Katelyn wants to buy a $75.00 skateboard and she has $25.00 saved and she mows lawns to make extra money and earns $20.00 for each lawn he mows.
Therefore the inequality that represents this context is,
20x + 25 ≥ 75.
20x ≥ 75 - 20.
20x ≥ 55.
x ≥ 55/20.
x ≥ 2.75, But she has to mow a lawn completely to get paid so she must mow 3 lawns.