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September 1, 2015

Homework Help: Math

Posted by Anonymous on Saturday, April 19, 2008 at 3:14am.

1)AP has U6=12.5 and U19=32
a+5d=12.5 (&)
a+18d=32 (2)
(2)-(1), d=1.5
therefore, a=5
(a)What is the nth term?Tn=5+(n-1)1.5
(b)What is the sum of 4 terms between U10 and U13 inclusive?

2)Un=1/2^n-3
(a)What is the nature of this sequence?
(b)Calculate the sum of the first nine terms?

3)Un=12-0.5n
(a)Solve SUMn=0
(b)If Wm=2+5m, when is Wm first a three digit number?
(c)Find m for the case where Wm=U10

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