Question

Using the explict formula find the 11th term f(n)=21+2(n-1)

Answer 1

f(11) = 41

Explanation:

substitute n = 11 into the explicit formula

f(11) = 21 +2(11 - 1) = 21 + 2(10) = 21 + 20 = 41

Answer 2

We are given the explicit formula to be

f(n) = 21 + 2(n - 1)

Where n = number of terms

Find the 11th term?

Using the above formula

Let n = 11

f(11) = 21 + 2(11 - 1)

f(11) = 21 + 2(10)

f(11) = 21 + 20

f(11) = 41

The answer is 41