Is this true the sum of two number can never be zero

False... unless the numbers are both positive.

Step-by-step explanation:

-3 + 3 = 0.

Two positive numbers will never equal zero (as long as they are both not zero.

If you take a positive number and then add the negative version of that number, it will equal zero. For example, -1 + 1 = 0, -5 + 5 = 0, -1591 + 1591 = 0

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.

each side has a different length.  

step-by-step explanation: