Use an x to represent each unknown number.
Twice the sum of a number and three.
2(x + 3)
15 more than twice a number use the variable n to represent the unknown number
To represent the unknown number, we can use the variable "x".
The statement "Twice the sum of a number and three" can be translated into an equation as follows:
2(x + 3)
Here's how we got it:
1. We start with the unknown number, which is represented by "x".
2. We add three to the unknown number: x + 3.
3. We multiply the sum by two: 2(x + 3).
So, 2(x + 3) is the expression that represents "Twice the sum of a number and three" using the unknown number represented by "x".