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8
∑ 4 + 4n
n=1
∑ 4 + 4n = 4 ∑ 1 + n
4 * 8 + 4 ∑ n
32 + 4 [8 * 9 / 2]
32 + 40
72 inches

ok can you help me then @jim_thompson5910

How many computers are we talking about here?

so you're not summing to 8 up at the top (of the sigma), you're summing to 6

thats the problem above says so i guess so

so it should be
\[\Large \sum_{n = 1}^{6}4+4n\]
for part 1

so is the first and 2nd part for part 2 right?

first part is, but the second is not...and you'd have to use 6 instead of 8

∑ 4 + 4n = 4 ∑ 1 + n
4 * 6 + 4 ∑ n
24 + 4 [6 * 7 / 2]
24 + 25
49 inches

4 [6 * 7 / 2]
doesn't become
25

84? i added thats why

108 inches ?

it is 108 inches

108 is the total final answer for part 2

can you help me with another problem?

sure, what is it

nevermind i found it

but i do need help with What is the 5th partial sum of ∑[i=1,∞,-1+5n]

the answer i got for the last problem was 11,170

same thing, but you're now doing it with -1+5n

i got 60 ?

Evaluate each piece, then add them all up

70?

yes, you are correct
the answer is 70