The product of 2 and the quantity of a number n and 10.

Answer 1

Let's break down the phrase to write it as a mathematical expression:

1. "A number n and 10": This implies addition, so n+10.
2. "The quantity of a number n and 10": This means we treat n+10 as a single unit, usually indicated by parentheses: (n+10).
3. "The product of 2 and the quantity...": "Product of" means multiplication.

So, the expression is:

2(n+10)