Laural had to find the sum for the arithmetic series below, what did she do wrong?

Joe wanted to solve this problem: The number of visitors to a website in the first week is 40. The number of visitors each week is double the vistitors of the previous week. What is the total number of visitors in the first 10 weeks. What did he do wrong?

Megan wanted to find the 15th term in the arithmetic sequence given the explicit formula below. What did she do wrong?

Guest Mar 2, 2021

#1**+1 **

First one......step B is incorrect because

a_{1} is not 1

Instead, you should correct a_{1} to this:

a_{1} = 3(1) - 1 = 2

The sum is (2 + 35) (12/2) = 37 * 6 = 222

CPhill Mar 2, 2021