320
I am positive it's correcf
For this case we have a system of two equations with two unknowns:

We follow the steps below:
We add the equations:

We divide between 9 on both sides of the equation:

We substitute the value of "x" in the first equation and find the value of y:

Thus, the solution of the system is: (3, -1)
Answer:
(3, -1)
Answer:
1 hour and 40 minutes
Step-by-Step
4:10 to 5:10 is 1 hour. 5:10 to 5:50 is 40 minutes. Put it together and its 1 hour and 40 minutes.
The correct answer is C.
Hope this helps.
3x^2 - 12 = -12
3x^2/3 = 0
x = 0