Question

Which function represents the sequence?

f(n)=n+3

f(n)=7n−4

f(n)=3n+7

f(n)=n+7

Answer 1

Let's have in mind:

f(n) = a1 + (n - 1).r

r = a2 - a1

r = 10 - 3

r = 7

So,

f(n) = a1 + (n - 1).7

f(n) = 3 + (n - 1).7

f(n) = 3 + 7n - 7

f(n) = 7n - 4