This recipe requires a certain amount of ingredients.

He makes it a point to read a certain number of books every month.

The budget for this project is set and will not change.

He always treats his haters with respect.

In this equation, x is a variable and 5 is a constant.

In computer graphics, anti-aliasing plays an important role.

This project meets a certain standard.

He is good at mathematics.

He took a deep breath, breathed in the fresh air, and showed a relaxed expression.

He is bad at remembering numbers.