Question

Multiple Response: Please select all correct answers and click "submit." Which of the following statements contain a variable? Check all that apply. A. There are 60 seconds in a minute. B. Double the number of pages in the book. C. He is 15 years old. D. The age of my friend.

Answer 1

b and d because a variable is something that can change. there will always be 60 sec. in a min. , and at that specific time, the boy is fifteen.
hope that makes sense :)