Final answer:
The expression -3 - (-10) describes subtracting negative ten from negative three, which is equivalent to adding positive ten to negative three, resulting in positive seven.
Step-by-step explanation:
The mathematical expression -3 - (-10) can be verbalized as 'subtract negative ten from negative three.' In mathematics, subtracting a negative number is the same as adding its positive counterpart. Therefore, this expression simplifies to -3 + 10, which equals 7. We changed the sign of the subtracted number, from negative ten to positive ten, and then added it to negative three following the rule that when two numbers with opposite signs are added, we subtract the smaller number from the larger one, and the answer has the sign of the larger number. In this case, since ten is larger than three and has a positive sign, the result is a positive seven.