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September 23, 2014

September 23, 2014

Posted by **Carson** on Sunday, January 9, 2011 at 7:14pm.

1. 175 + 37 + 25

2. 50(11 x 2)

3. 12/(99

can someone explain to me how to do these please?

- Math -
**Damon**, Sunday, January 9, 2011 at 7:57pm200+37 = 237

50*2 = 100

100*11 = 1100

[12/(100-1)] [(100+1)/(100+1))]

[1200 +12]/(10,000-1)

1212/9,999 etc

.1212121212........

- Math -
**Damon**, Sunday, January 9, 2011 at 8:15pmproof

.12 + .12/100 + .12/10^4 + .12/10^6 ....

geometric series, g = .12

term 1 = .12/100

term n = term(n-1)*1/100

so r = 1/100

so 1 - r = 100/100 - 1/100 = 99/100

sum = g/(1-r) = 12/100 /(99/100) = 12/99

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