Which statement BEST describes why this set of ordered pairs is NOT a function?
{(1,5),(2,6),(3,6),(4,1),(4,20),(5, 21), (6, 24)
A. There is no value k such that y = kx for all the
ordered pairs.
B. The y-value of 6 is paired with two different x-
values.
C. The x-value of 1 is mapped to 5, but the x-value
of 5 is not mapped to 1.
D. The x-value of 4 is paired with two different y-
values.

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?