Asked by Adeola

The 10th term of an arithmetic progression is _27 and 5th term is _12 ,what is the 18th term ?find also the sum of its 25 term
Answered by R_scott
a + 9d = 27

a + 4d = 12

subtracting equations ... 5d = 15

solve for d , then substitute back to find a

Answered by oobleck
Adjust as necessary if you really meant -27 and -12
Answered by Timothy
Art
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