Question

A) write down the next two terms in the sequence
20, 16 1/2 , 13 , 9 1/2 , 6, ......

B) write down an expression in terms of n , for the nth term of the sequence
1, 4 ,7 ,10 , 13

Answer 1

(A)

The next 2 terms are 2 1/2 and -1

(B)

1+(n-1)*3=1+3n-3=3n-2

Answer 2

it's difference = -3.5
6 thterm = 20 -5 ×3.5
= 2.5
7 th= -1

B) 1 + (n-1)3
1 + 3n -3
-2+3n