Question

The nth term of a sequence is 5n + 1. What is the sum of first four terms?
A) 21
B) 44
C) 50
D) 54

Answer 1

Step-by-step explanation:

The nth term of a sequence is 5n + 1.

What is the sum of first four terms = ?

suppose n = 4

5n + 1

5 (4) + 1. ( 5×4= 20 )

20 + 1

21

21 is the first four terms option (a) 21

Answer 2

Answer:

d) If the nth term of a sequence is 5n + 1, then the sum of the first four terms is 54.

Step-by-step explanation:

If nth term of a sequence is 5n + 1

Then first term = 5(1) + 1 = 6

Second term = 5(2) + 1 = 11

Third term = 5(3) + 1 = 16

Fourth term = 5(4) + 1 = 21

So, the sum of first four terms = 6 + 11 + 16 + 21 = 54