write an expression for "the sum of twice a number and nine"?

Question

this is a 5th grade question

Answer 1

The first thing we need to do is translate the words into a math equation.

We can use a letter to represent "a number." Let's use "x."

Twice a number....this translates to multiplication.

We have established that "a number" = x. So far this is what our math equation look like:

2x.

"and" in math always translates to additions. We need to add "nine" to our previous equation: 2x.

The expression is as follows:

2x + 9