Hello :
the nth term ( general term of an arithmetic sequence is :
An =A1+(n-1)d ....a common difference is : d , A1 : the first terme
A1 = 5 and : d = 1 - 5 = - 4 n = 21
A21 = 5 + (21 -1)(-4)
A21 = 5 - 80 = -75
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1st multiply 2 x 8 x 144 = 2304 in^3divide 2304 by 144 = 16 board feet
It would be 6(4a2 - 3)
you would factor out just the 6 because the 18 doesn’t a a term with it like 34a2 does. then just divide normally to get ur answer 6(4a2 - 3)
Thirty four times 000 which I am assuming is just zeroes would be 0.
The y intercept is 17. You can see it clearly in the equation.