- 3+(-7)
4
— 10
- 4
10
hurry pls !

Step-by-step explanation:

-3+-7

+×-=-

-3-7=-10

-10

-10

Step-by-step explanation:

-3 + - 7 = - 10

When you have 2 numbers with the same sign, you add them together and carry the sign over.

Example

-4 + -9   just add 4 and 9, which is 13, and carry the sign over (which is a -) so

-4 + -9 = -13

Another example

4 + 9  add the 4 and the 9, which, again, is 13, and carry the sign over (which is a +) so

4 + 9 = 13

It's different if you are mixing signs in a problem.

Example:

4 + -9 = ?  In this case we can re-write it as 4 - 9, since 9 is larger than 4 we know the answer will be negative. So, we can switch it, to make it easy and take -9 + 4 now it's easier to see the answer is -5.