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April 25, 2015

Homework Help: Calculus

Posted by Anonymous on Tuesday, September 20, 2011 at 9:02pm.

For the Arithmetic sequence, determine the value of t1, and d. An explicit formula for the general term. And T20.

7/4, 1, 1/4, -1/2

I don't know how to do this the fraction way, but by doing this the decimal way, the common difference I got is -0.75. T1 would be 7/4.

Formula would be.

Tn = a +(n-1)d
Tn = 1.75 + (n-1)-0.75
Tn = 1.75 + -0.75n -0.75
Tn = -0.75n + 1

T20....

T20 = 1.75 + (20-1)-0.75
T20 = 1.75 + (19) - 0.75
T20 = 1.75 - 14.25
T20 = -12.5

I definitely got the last one wrong, please help.

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