Zach read a book for 10 minutes every weekend in the first month, 20 minutes in the second month, 40 minutes in the third month, and 80 minutes in the fourth month. Victoria read a book for 35 minutes every weekend in the first month, 50 minutes in the second month, 65 minutes in the third month, and 80 minutes in the fourth month. Which statement best describes the methods used by Zach and Victoria to increase the time they spent reading a book? Zach's method is linear because the number of minutes increased by an equal factor every month. Victoria's method is linear because the number of minutes increased by an equal number every month. Both Victoria's and Zach's methods are exponential because the number of minutes increased by an equal factor every month. Both Victoria's and Zach's methods are exponential because the number of minutes increased by an equal number every month.

Answer: The correct statement is "Victoria's method is linear because the number of minutes increased by an equal number every month".Explanation:From the given information Zach read a book for 10 minutes every weekend in the first month, 20 minutes in the second month, 40 minutes in the third month, and 80 minutes in the fourth month.The sequence of Zach is 10, 20, 40, 80. Which is a geometric sequence with common ratio 2. So, Zach's method is exponential.Victoria read a book for 35 minutes every weekend in the first month, 50 minutes in the second month, 65 minutes in the third month, and 80 minutes in the fourth month.The sequence of Victoria is 35, 50, 65, 80. Which is a arithmetic sequence with common difference 15. So, Victoria's method is linear.From the correct statement is "Victoria's method is linear because the number of minutes increased by an equal number every month".