Chapter 6.4, Problem 21E

The number of daylight hours, d, can be modeled as a function of the day of the year by the equation d (t) = 3.5 sin +12.2, where t represents the number of days since March 21st. Which of the following 365 represents the minimum number of daylight hours predicted by this model? (1) 7.2 (3) 8.7 (2) 8.1 (4) 9.2

2. Determine whether these are well-defined functions. Explain. 3 (a) f:R → R, where f(x) = x² + 5° 7 (b) g: (5, 0) → R, where g(x) = 4 (c) h:R → R, where h(x) = –/7 – 4x + 4x². |

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