Answer:
We can write the inequality for the ice cream scoops as:
![3S+2M\leq20](https://img.qammunity.org/2021/formulas/mathematics/college/k7oqguup9ys3tn4l8h0e4qt40cr7tsm53h.png)
Explanation:
There are 20 ice cream scoops available.
The inequality will represent that the ice cream coops used will be equal or less than the 20 ice cream scoops available.
We know that a sundae (S) uses 3 ice cream scoops and that the milkshakes (M) uses 2 ice cream scoops.
Then, the the ice cream scoops used can be written as:
![3S+2M](https://img.qammunity.org/2021/formulas/mathematics/college/1ejenw23yky8ssjjca0id7r67tk4k85old.png)
This sum has to be at most 20, so we can write the inequality as:
![3S+2M\leq20](https://img.qammunity.org/2021/formulas/mathematics/college/k7oqguup9ys3tn4l8h0e4qt40cr7tsm53h.png)