# How do you write an algebraic expression that models the word phrase "The amount of money you spent if you started with $40 and now have d dollars"? ##### 2 Answers Jan 23, 2016 Let's call the amount spent $s$#### Explanation: We know that the amount spent and the amount left adds up to $40, or in formula-form: $s + d = 40$

Or in another form (by subtracting $d$ on both sides):
$s = 40 - d$

Jan 23, 2016

40 - a = d

#### Explanation:

let the amount of money spent be a

started with 40 and spent a is represented by : 40 - a

left with d , hence 40 - a = d