To find the first five terms of the sequence defined by an = 1n + 4n, we need to clarify the interpretation of the expression. Assuming n refers to natural numbers starting from 1, we will evaluate it as follows:
- For n = 1:
a1 = 1(1) + 4(1) = 1 + 4 = 5 - For n = 2:
a2 = 1(2) + 4(2) = 2 + 8 = 10 - For n = 3:
a3 = 1(3) + 4(3) = 3 + 12 = 15 - For n = 4:
a4 = 1(4) + 4(4) = 4 + 16 = 20 - For n = 5:
a5 = 1(5) + 4(5) = 5 + 20 = 25
Therefore, the first five terms of the sequence are: 5, 10, 15, 20, 25.