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January 30, 2015

January 30, 2015

Posted by **molly** on Sunday, September 20, 2009 at 8:25pm.

- math -
**sydney**, Sunday, September 20, 2009 at 8:34pmtn = a1 + (n-1)d

t2 = 12 and t3 = 24 so d= 24-13=11

so we need to find a1

t2=a1 + (n-1)d

12 = a1 + (2-1)11

12 = a1 +11

1 = a1

then

t15 = 1 + (15-1)11

t15 = 1 + 154

t15 = 155

- math -
**maribel**, Sunday, September 20, 2009 at 8:40pmuse the arithmetic sequence formula

a(n)=a(1)+(n-1)d

last=first+(number-1)difference

?=4+(15-1)20

?=284

im pretty sure lol

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