Question

need help pls help

Answer 1

\[\sum_{n=2}^{10}-2n-3\]

Answer 2

@Rohitkhanna

Answer 3

n=2 or n=1????????

Answer 4

2

Answer 5

@Rohitkhanna plsssss help

Answer 6

@Disco619

Answer 7

quiet same as the last one
-2 is repeatedly being multiplied to diff. no. from 2 to 10.
-2(2+3+4.....+10)-3. we can treat the no. under the bracket as an arithmetic progrssion with a=2and d=10 and n=9(no. of terms).
-2((n/2)(2a+(n-1)d))-3

Answer 8

wohoo, is that n=2 on the bottom?

Answer 9

yes it is

Answer 10

it looks like a -, im not sure

Answer 11

using a graphing calc i got -135

Answer 12

didnt u get the solution given by me??????????

Answer 13

to do it by hand, replace the x with 2, and add again with 1 more than the prev addition, meansing 2,3,4,5,6,etc all the way till 10,


and rohitkhanna, he asked in the chat thing, so i ddint read yours.

Answer 14

close when your done

Answer 15

i wasnt asking u zubhanwc