Tim had 2b books for sale at a price of k dollars each. if y is the number of books he did not sell, which of the following represents the total dollar amount he received in sales from the books?

a. k(2b-y)
b. k(y-2b)
c. ky - 2b
d. 2b - ky
e. 2bk - y

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?