That is just absolute value, basically what it means is take off whatever sign there was attached to it (such as a negative sign)
We can write out a formula in order to solve this. Since sum represents addition, if x represents the unknown number, we can write the formula: x+51=-21. Then, to solve for x, you would subtract 51 from both sides to get x=-72 which is the final answer.
Answer:
6/1000
Step-by-step explanation:
.0006 times 10,000