Reagan is 3.5 inches shorter than Cassidy. If Reagan is 39 inches tall, which equation could you use to find Cassidy's height?

3.5-c=39
39-3.5=3.5
c-3.5=39
39-3.5=c

c - 3.5 = 39

The correct equation to find Cassidy's height is c - 3.5 = 39.

To find Cassidy's height, we need to set up an equation based on the information given. Let's assume Cassidy's height as 'c' inches.

The given information states that Reagan is 3.5 inches shorter than Cassidy. Since Reagan's height is 39 inches, we can set up an equation as:

c - 3.5 = 39

This equation implies that if we subtract 3.5 inches from Cassidy's height, we should get 39 inches, which is Reagan's height.

Therefore, the correct equation to find Cassidy's height is c - 3.5 = 39.