NSimplify each expression. Write your answer in standard form. 1) (3a + 12a) + (50 - 9a - 5) T 2) (-562 - 5) - (36? – 46 – 8) 3) 2c2 (4c- 3c + 11) 4) (d + 4) (d - 7) 5) (f - 5) = 6) (2x - 5) (5x + 3) = 7 (9 - 7) (9 + 7)

In one day there are too high tides into low tides and equally spaced intervals the high tide is observed to be 6 feet above the average sea level after six hours passed a low tide occurs at 6 feet below the average sea level in this task you will model this occurrence using a trigonometric function by using x as a measurement of time assume the first high tide occurs at x=0. a. what are the independent and dependent variables? b. determine these key features of the function that models the tide: 1.amplitude 2.period 3.frequency 4.midline 5.vertical shift 6.phase shift c. create a trigonometric function that models the ocean tide for a period of 12 hours. d.what is the height of the tide after 93 hours?