SOLUTION: Can you help me with this? I am lost as to how to determine the a(1) before I solve. Thank you in advance. Find the sum of the arithmetic sequence having the data given. a(n)=5,

Question 309124: Can you help me with this? I am lost as to how to determine the a(1) before I solve. Thank you in advance.
Find the sum of the arithmetic sequence having the data given.
a(n)=5, d=-2, n=12
Tina

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Here's what you know,

Here's the general equation.

Plug in what you know,

Now solve for

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