Negative 3 plus negative 17 minus negative 13

-7

Step-by-step explanation:

(-3) + (-17) = (-20)

(-20) - (13) = (-7)

This is all because when adding a negative with a negative, it's like adding normally with positives but with a negative answer at the end. For example we would have (-3) + (-5). I would just add these normally (3 + 5)=8 and then add a negative at the end. Same sequence with subtracting.

coins of silver or gold

step-by-step explanation: