Answer:
A
Step-by-step explanation:
We are given the following expression:
0.00033 + 2.1*10^-6
We have to place them in the same base.
Trying the problem options:
10^(-4)
0.00033 = 3.3 * 10^(-4)
2.1*10^(-6) = 0.021 * 10^(-4)
The sum is: 3.321 * 10^(-4)
Option A is the answer
