Question

Find the sum of the summation of 2 i minus 9, from i equals 3 to 10.

Answer 1

\[\sum_{3}^{10}2i-9\]?

Answer 2

yes, except at the bottom of that E thing, its i=3

Answer 3

got it
a few steps are needed
ready?

Answer 4

yes

Answer 5

first replace \(i\) by \(3\) in \(2i-9\) what do you get ?

Answer 6

-3?

Answer 7

lol yeah \(-3\)!!

Answer 8

now hold on to that number for a sec
replace \(i\) by \(10\) in \(2i-9\) what do you gte ?

Answer 9

11

Answer 10

ok now add those two numbers

Answer 11

8?

Answer 12

yup
now divide that by 2

Answer 13

4

Answer 14

one more step

Answer 15

which might be a little confusing
you actually have 8 terms to add up \(10-3+1=8\)
take your 4 and multiply it by 8

Answer 16

32

Answer 17

and that is your final answer

Answer 18

want to check it?

Answer 19

I turned in the test. It was right. Thank you so much!

Answer 20

you are quite welcome