Question
Use the following information to answer the next question. The sunrise time for a particular Alberta city can be modelled by the sinuscidal regression function S=1.51sin(0.0172d+1.51)+7.00 where S is the sunrise time in hours after midnight, and d is the number of days since the beginning of the year (January I=1 January 2=2 etc.) 24. According to the sinusoidal regression function, determine the sunrise time on August 15 (day 227) to the nearest hundredth of an hour, after midnight.
Solution
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EwanMaster · Tutor for 5 years
Answer
Here's how to determine the sunrise time on August 15th (day 227):<br /><br />1. **Substitute the value of 'd' into the equation:**<br /> d = 227<br /><br /> S = 1.51sin(0.0172 * 227 + 1.51) + 7.00<br /><br />2. **Calculate the value inside the sine function:**<br /> 0.0172 * 227 = 3.9044<br /> 3.9044 + 1.51 = 5.4144<br /><br />3. **Calculate the sine value:**<br /> sin(5.4144) ≈ -0.77 (Make sure your calculator is in radian mode)<br /><br />4. **Complete the calculation:**<br /> S = 1.51 * (-0.77) + 7.00<br /> S = -1.1627 + 7.00<br /> S ≈ 5.84<br /><br />Therefore, the sunrise time on August 15th is approximately 5.84 hours after midnight. This translates to 5:50 am (0.84 hours * 60 minutes/hour ≈ 50 minutes).<br />
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