Question

Find the first term of the arithmetic sequence in which a38= -5 and the common difference is -2.9

Answer 1

Answer: 102.3 Hope that helps

Answer 2

102.3

Explanation:

a_38 = -5

difference d= -2.9

We use general formula

`a_n = a_1 + (n-1)d`

WE make the formula for a_38 th term

Plug in 38 for n

`a_(38) = a_1 + (38-1)d`

Now plug in -2.9 for d and -5 for a_38

`-5 = a_1 + (38-1)(-2.9)`

`-5 = a_1 - 107.3`

Now add 107.3 on both sides

102.3 = a_1

option A is correct