Answer: 8
Step-by-step explanation:
From the question, we are informed that we should find d(21) in the sequence given by d(n) = 2+0.4(n-1). This will be:
d(n) = 2+0.4(n-1)
d(21) = 2 + 0.4(21 - 1)
= 2 + 0.4(20)
= 2 + 8
= 10
Therefore, based on the above calculation, we can deduce that the 21st term is 8.