Question

The function r(n) = 5n² + 1 represents the value of the nth term in a sequence.

What is the sum of the 1st and 3rd terms of the sequence?

Answer 1

Explanation:

a_n=5n²+1

➜a_1=5(1)²+1

➜5×1+1

➜5+1

➜6

➜a_3=5(3)²+1

➜5×9+1

➜45+1

➜46