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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?

 Mar 2, 2021
 #1
avatar+118069 
+1

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

 

a1   is   not    1

 

Instead, you should correct a1 to this:

 

a1  =  3(1)  - 1   =   2

 

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

 

 

cool cool cool

 Mar 2, 2021
 #2
avatar+118069 
+1

Second one

 

Step  C is incorrect   because  210  is  NOT  =  20

 

Correction   :   210  = 1024

 

The  sum  is

 

( 40)  ( 1 -1024)  / ( 1 - 2)    =   40920

 

cool cool cool

 Mar 2, 2021
 #3
avatar+118069 
+1

Last  one:

 

This  should  be easy to spot

 

Step C   is  incorrect      2(15)  is not  =  17

 

You should be able to take it  from there

 

cool cool cool

 Mar 2, 2021

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