Question

For each sum find...

Answer 1

Hey @hartnn ! You got time?

Answer 2

@bookworm00981 How bout you buddy? :)

Answer 3

Ms. @Preetha ? Can you help me out with this?

Answer 4

:)

Answer 5

for a)

you have one term for n = 1 to 5 - this gives you the number of terms

Answer 6

So there's 5 terms?

Answer 7

yes
the first term can be found by plugging in n = 1 in the formula
and last by doing the same with n=5

Answer 8

So 3(5) + 1 right? And then that will equal 16

Answer 9

this is an arithmetic series
thats the last term yes 16

Answer 10

so the first term is 4?

Answer 11

Since I plugged in n=1?

Answer 12

sum of n terms = (n/2)[a + l]
where a = first term l = last term

n = number of terms i in this case it is 5

Answer 13

yes

Answer 14

Ok! So that means the sum is (5/2)[4+16] which equals 50!

Answer 15

2.5 times 20 equals 50!

Answer 16

yup

Answer 17

pretty easy right?

Answer 18

It sure was! :)

Answer 19

Well thanks again! See ya!

Answer 20

bye