The best way to approach this problem is to look at the graph of the given function. Replace values of x from 1 to 24 to indicate the numbers of hours in a day. As seen on the graph, there is only one point where the port is at high tide. That would be at 1:00 am.
Looking at the graph, it would be safe for the boats to be in the port when the graph levels off at around 10 to 24. That's from 10 am to before 12 midnight. Then, they would have to stay away between 12 midnight to before 10 am.
7x20x11= 1540
30x4x11=1320
1540+1320=2860
One backpack = 3/4
6 backpacks = 3/4 x 6 = 18/4 = 4.5 yards
Formula in terms of q is: 
Step-by-step explanation:
We need to write the formula in terms of q of the equation: 
We will solve the given equation to find the formula in terms of q

Adding -3q on both sides

Adding -12r on both sides

Divide both sides by -10

So, formula in terms of q is: 
Keywords: Solving Equations
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