Honestly i know this is easy but i just cant think ive had a total mind block, im doing the geometric series and need to get the sum of the first 10 numbers starting
2 + 0.8 + 0.32 ...
2007-04-28 00:21:15 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2 x 0.4 = 0.8
- - - - - - - - - - s-
2007-04-28 01:46:43 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
2 times ? = 0.8.
so ? = 0.8 divide by 2. So it's 0.4
Now, for a geometric series, let's check that this is correct.
2 * 0.4 = 0.8. check
0.8 * .4 = 0.32 check
and then next term should be 0.32 * 0.4 = 0.128
good luck with the rest. p.s. we ALL get mental blocks sometimes! :)
2007-04-28 00:29:20 · answer #2 · answered by emin8r 2 · 0⤊ 0⤋
r = 0.8 / 2 = 0.4
S10 = 2(1 - 0.4^(10)) / 0.6
S10 = 2(1 - 0.0001049) / 0.6
S10 = 2 (0.9998951) / 0.6
S10 = 3.3329837
2007-04-28 02:03:59 · answer #3 · answered by Como 7 · 0⤊ 0⤋
0.8/2 = 0.4
I'll help:
so, 2 + 0.8 + 0.32+0.128+0.0512+0.02048+0.008192
+0.0032768+0.00131072
and... the answer is 3.332983808
2007-04-28 00:47:40 · answer #4 · answered by Kuan T 2 · 0⤊ 0⤋
The answer is 0.4
2007-04-28 00:26:15 · answer #5 · answered by Mmmbop103 1 · 0⤊ 0⤋
2 x 0.4 = 0.8
So your answer should be: 0.4
2007-04-28 00:31:51 · answer #6 · answered by alvinli2000 3 · 0⤊ 0⤋
It's 0.4 - good luck
2007-04-28 00:27:29 · answer #7 · answered by ash 2 · 0⤊ 0⤋
2x = 0.8
x = 0.8/2
x = 0.40
2007-04-28 00:31:37 · answer #8 · answered by detektibgapo 5 · 0⤊ 0⤋
go with Just Ask's response. It's right.
2007-04-28 00:27:27 · answer #9 · answered by Holly R 6 · 0⤊ 0⤋
0.4
2007-04-28 02:33:00 · answer #10 · answered by Chatterbox 3 · 0⤊ 0⤋