# How do you write an expression for: The sum of 3 and 8 plus 7?

Jul 28, 2016

$\Rightarrow 15 + x + 7$

#### Explanation:

The phrase "the sum of" indicates an addition and it is always used with the word "AND".

The "sum of'" 3 "AND" 8 means: 3 + 8.

The sum of 15 and x, plus 7, means:

$\left(15 + x\right)$, with 7 added on afterwards.

$\Rightarrow 15 + x + 7$