+0

0
38
1

How is the sum expressed in sigma notation?

13 + 21 + 29 + 37 + 45

$$\sum_{i=1}^{5}$$(        )

Apr 24, 2020

#1
+21017
+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

Apr 24, 2020