Khalil says that any time two numbers are the same distance from 0, their sum will be zero. Marius disagrees. "Sometimes the sum will be positive, but sometimes it will be negative."

Marius is right.

Step-by-step explanation:

So although what Khalil said could be correct, they didn't say it right. It would be any two numbers the same distance from 0 going the opposite ways, which means that if you had 3 on one side, you would have -3 on the other side. BUt since Khalil said it wrong, he's basically saying that you can do 3+3 because they're both the same distance away from 0. or you could do (-3)+(-3)=-6 which would still work because they're the same distance away from 0. So unless you just skipped on that part while typing the question, Marius is correct.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles