Question

. Find the sum.

Answer 1

of?

Answer 2

\[\sum_{100}^{n=1}7n\]

Answer 3

how do you do this?

Answer 4

waittt this is backwardsss

Answer 5

good question im sorry i cnt help you love

Answer 6

\[\sum_{n=1}^{k}an=a\frac{k(k+1)}{2}\]

Answer 7

\( \sum \limits_{100}^{n=1}7n \); is meaningless but \( \sum \limits_{n=1} ^{100}7n \) is an arithmetic progression.

Answer 8

\( \huge \sum \limits_{n=1} ^{100}7n = 35350 \)

Answer 9

thank you foolformath! but how exactly did you do this?

Answer 10

See, Zarkon's answer.

Answer 11

\[7\frac{100(100+1)}{2}=35350\]

Answer 12

so if i had this equation,\[\sum_{n=1}^{100}2n\] my answer would be 10100
am i right?

Answer 13

yes

Answer 14

ohhh ok thanks!