How is the sum expressed in sigma notation?

13 + 21 + 29 + 37 + 45

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\(\sum_{i=1}^{5}\)( )

Guest Apr 24, 2020

#1**+1 **

The numbers increase by 8 each time; this is the slope so the formula will have the form 8i + .

To find the , put in 1 for i and see that your answer is 8, not 13; so, you will need 5 more.

[This is also true if you put in2 for i and see that your answer is 16, not 21.]

So, the formula is: 8i + 5

geno3141 Apr 24, 2020