Question

help please
Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below.

25
775
1,125
500

Answer 1

you can just find what the 4 th and 5th terms are then add them up
Do you see the pattern?

Answer 2

how do you get from 400 to 200 and from 200 to 100?
what process is done on 400 and 200 to get the next number?

Answer 3

and what would you do to 100 to get the next number in the series?

Answer 4

would the answer be 25?

Answer 5

No how could it be 25?
S5 means the Sum of 5 terms

Answer 6

Oh i don't know. so what would the answer be

Answer 7

to get the next term in the series you multiply by 0.5
400 * 0.5 = 200
200 * 0.5 = 100
so what are the next 2 terms?

Answer 8

0.5 * 100 = ?

Answer 9

100 * 0.5 = 50
50 * 0.5 = 25

Answer 10

exactly
so you have the first 5 terms
so all you have to do is add them up
400+ 200 etc

Answer 11

can you do that
S5 = 400+200+100+50+25

Answer 12

yes i got it
thank you

Answer 13

yw