How can you add -13 + 10?

Easy it just goes into the negative zone but if your trying to add in it would look like this 10+(-13)=3

HOPE THIS HELPS

Also here's some other info

its gonna be -3

Step-by-step explane

13 is in the negatives and the 10 is in the positives you have to add the positives to the negatives

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it