9) Which of the following shows the Associative Property of Addition A. (18+41) + 12 = (41 + 18) + 12
B. 18+ 41 = 41 +18
C. 18+ 4) = (10 + 40) + (8 +1)
D. (18+41) + 12 = 18+ [41 +12)
Hel

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?