Final answer:
The correct calculation of -0.8 + 0.6 results in -0.2, which is not represented by any of the provided number line options.
Step-by-step explanation:
The calculation to perform is -0.8 + 0.6, which involves adding a negative number to a positive number. To visualize this on a number line, you start at -0.8 and move 0.6 units to the right, because you are adding a positive number. After moving 0.6 units right from -0.8, you end at -0.2. None of the provided options (a) -18 -12 (b) 04 (c) 08 (d) 12 correctly shows this value on the number line.