Question

Write the sum using summation notation, assuming the suggested pattern continues. (2 points)

-9 - 4 + 1 + 6 + ... + 66

Answer 1

You need to know how many #s you have in the sequence, the pattern itself and fit those two informations together. Which of them is the problematic one?

Answer 2

i dont understand

Answer 3

@rational

Answer 4

Well... can you figure out the pattern it follows?

Answer 5

Like I'm doing this without looking at the lesson because the ebook isn't working

Answer 6

@Nnesha help

Answer 7

@UnkleRhaukus

Answer 8

Can you spot the pattern? how much do the terms go up by, each time?

Answer 9

up 5

Answer 10

IS it C or B

Answer 11

-9

Answer 12

if the first term is -9, what is in the summand?

Answer 13

and it doesn't look like it goes on forever

Answer 14

how do u tell if the summand is infinite?

Answer 15

starts at -9,
stops at 66

Answer 16

so its B

Answer 17

\[\sum_{i=0}^?-9+5i\]

Answer 18

15 is the summand but why

Answer 19

how many terms are there?

Answer 20

15

Answer 21

then you get\[\sum_{i=0}^{14}-9+5i\]

Answer 22

thanks :)))

Answer 23

oh, but did you count all those terms correctly?

Answer 24

66-(-9) = 75 = 5*15

but we started at zero, so there are 16 terms

so
\[\sum_{i=0}^{15}-9+5i\]