Shelby bought a bag of 30 sour candies. She ate c of the candies. Write an expression that shows how many sour candies Shelby has now.

1. Break Down the Problem

Shelby initially has 30 sour candies. After eating $c$ candies, we need to determine how many candies remain.

2. Relevant Concepts

The total number of candies Shelby has after eating some can be expressed as:

$\text{Remaining Candies} = \text{Initial Candies} - \text{Candies Eaten}$

3. Analysis and Detail

• Initially, Shelby has 30 candies.
• She eats $c$ candies. Therefore, the expression for the remaining candies can be written as:

$\text{Remaining Candies} = 30 - c$

4. Verify and Summarize

The expression $30 - c$ accurately represents the number of candies left after Shelby eats $c$ candies.

Final Answer

The expression showing how many sour candies Shelby has now is: $30 - c$