Question

find the indicated sum for the arithmetic series
S18 for 3.2+2.9+2.6+2.3+...

Answer 1

do you know how to solve this equation

Answer 2

yeah i already found the common difference which is 0.3

Answer 3

so what do you do after that

Answer 4

i put the equation:
a18=3.2+(18-1)(0.3)
=8.3

Answer 5

correct

Answer 6

then i got the equation
Sn=n[ a1+a2/2]
plugged in the numbers
S18 = 18 [3.2+8.3/2]
=18(5.75)
=103.5

Answer 7

yes that is the awnser good job

Answer 8

really ? cool, thanks man(:

Answer 9

its no problem please message me if you have any further questions