Step-by-step explanation:
3x + 12 - 2x + 8 + 5x
Solving like terms
x + 20 + 5x
20 + 6x
20 / 6 = x
Answer:
your answer would be 2 hours cause you know its not gonna be neither of the 3 hour cause it says it lasted 3 hours and that was over time and the other 2 was wrong so the answer is 2 hours
Answer:
45
Step-by-step explanation:

For

the derivative is negative.
For

the derivative is positive.
Therefore at

there's a minimum.