Question

What is the first term, common difference, and 16th term

Answer 1

The 1st term is -67

Explanation:

I. When Sn =
`(n)/(2)`(
`a_(1) + a_(n)`)

If Sn = 124, n = 8 and
`a_(n)` = 98

124 = 8/2(a + 98)

124 = 4(a + 98)

124 = 4a + 392

124 - 392 = 4a

-268/4 = a

-67 =
`a_(1)`

Hope that help :D