Yolanda had c dollars to begin with. She just spent 20 dollars. Using c, write an expression for the number of dollars she has left.

Break Down the Problem

1. Yolanda starts with an initial amount of money represented by the variable $c$.
2. She spends a fixed amount of money, which is 20 dollars.

Relevant Concepts

• The amount of money left after spending is calculated by subtracting the amount spent from the initial amount.

Analysis and Detail

1. To find out how much money Yolanda has left, we will use the expression: $\text{Amount left} = \text{Initial amount} - \text{Amount spent}$ Substituting the known values: $\text{Amount left} = c - 20$

Verify and Summarize

• We started with $c$ dollars. After spending 20 dollars, we confirmed through the expression that she has $c - 20$ dollars remaining.

Final Answer

Yolanda has $c - 20$ dollars left.