The video tutorial guides viewers through solving a problem involving tides using a cosine function. It begins with setting up a graph to represent time and depth, then plots high and low tides. The tutorial explains the cosine function's period and cycle, and how to determine the parameters A, B, C, and D. Finally, it presents the complete cosine function that models the scenario, encouraging viewers to subscribe for more content.

Why is it important to sketch a graph before solving the problem?

• To visualize the problem and understand the data

• To make the video more colorful

• To avoid using mathematical equations

• To impress the teacher

What is plotted on the x-axis of the graph?

• Depth of water

• Speed of tide

• Time in hours after midnight

• Temperature

What is the lowest possible tide level marked on the graph?

• 10 meters

• 5 meters

• 12 meters

• 2 meters

How is the time of 6:45 a.m. converted to hours after midnight?

• 6.45 hours

• 6.75 hours

• 7.45 hours

• 7.75 hours

What type of function is used to model the tide's movement?

• Cosine function

• Exponential function

• Sine function

• Linear function

What is the period of oscillation for the tide's movement?

• 6 hours

• 8 hours

• 10 hours

• 12 hours

Which value is determined first when finding A, B, C, and D?

• D

• C

• B

• A

How is the midline (D) of the cosine graph calculated?

• By dividing the lowest tide by two

• By multiplying the highest tide by two

• By adding the highest and lowest tide and dividing by two

• By subtracting the lowest tide from the highest tide

What is the amplitude (A) of the cosine graph?

• 3

• 5

• 4

• 6

What does the value of C represent in the cosine function?

• The x-coordinate of the starting point of the cycle

• The y-coordinate of the highest tide

• The period of the function

• The amplitude of the function