Question

Find the first term of the arithmetic sequence in which a28=423/4 and the common difference is 5/4

Answer 1

B

Explanation:

Answer 2

B) 72

Explanation:

The n-th term of an arithmetic sequence An = a1 + (n - 1) d

Given :

a28 = 423/4 and d = 5/4

So

a28 = a1 + (28 - 1)5/4

Now plug in a28 = 423/4

423/4 = a1 + 27(5/4)

a1 = 423/4 - 27(5/4)

= 423/4 - 135/4

a1 = (423-135)/4

a1 = 288/4

a1 = 72

Thank you.