we can show it better as follows:
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you could have used the sine equation as well. Check the next equation. Remember the question asked you to find the cosine function.
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i will add the following intervals so that we will see just the first 30 minutes on the graph. You do not have to do this step. I arrange the numbers of the x axis from the settings.
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use y=100 for finding the times when the altitude is 100 meters
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FINAL ANSWER
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