Question

Help with this

Answer 1

let n = 50 and calculate an

Answer 2

152

Answer 3

good, now find a1

Answer 4

-152+2sn/n

Answer 5

use the original formula to find an when n = 1

Answer 6

an = 3n + 2

Answer 7

5

Answer 8

good, now use your a1 and a50 values to find sn

Answer 9

wait a1=5
and an=50

Answer 10

or the other way around

Answer 11

scroll up, we calculated an

Answer 12

an=152
and a1=5?

Answer 13

good

Answer 14

11932

Answer 15

n = 50
a1 = 5
a50 = 152

sn = (n/2)(a1+a50) = ?

Answer 16

5+50 right

Answer 17

a1 = 5
a50 = 152

a1 + a50 = ?

Answer 18

25*55

Answer 19

1375

Answer 20

good, now

(n/2)(a1+a50) = ?

Answer 21

well n = 5 right

Answer 22

how many terms are we calculating the sum for?

Answer 23

50

Answer 24

50/2=25

Answer 25

good, so n = 50

Answer 26

so now we have:

n = 50
a1 = 5
a50 = 152

sn = (n/2)(a1+a50) = ?

Answer 27

(50/2)(5+152)
(25)(157)

Answer 28

good, and that equals...?

Answer 29

3925

Answer 30

good, that's your answer