4 times 7 is 14 so I think the answer is 14. So diane played 14 minutes more than Sandra. So I think the answer is 14!
2nd one, x^2 + 8x + 4
add 2x^2-x^2, 6x+2x, -3+7
we have
--------> equation 
--------> equation 
Multiply equation
by
both sides
------->
the two equations of the system are the same, both equations represent the same line
so
If a consistent dependent system that has an infinite number of solutions
therefore
<u>the answer is</u>
The system has infinite number of solutions
Answer: No solution
Step-by-step explanation: -12x-14=-62-12x
You would have to simplify the -12x but you can't so this would be a no solution.