Answer:
10 hours
Step-by-step explanation:
320 = 30x + 20
300 = 30x
x = 10
Answer:
what the question in this
Step-by-step explanation:
For this case we have the following equation:

Deriving we have:

We match zero:

We clear the value of x:

Then, we substitute the value of x in the equation of the parabola:

Thus, the vertex of the parabola is the ordered pair:
Answer:
The vertice is: