Which expression(s) are equivalent to the given expression? 6x−18y+36

2(3x−9y+18) 2 times open paren 3 x minus 9 y plus 18 close paren

3(2x−6y+12) 3 times open paren 2 x minus 6 y plus 12 close paren

4(2x−14y+32) 4 times open paren 2 x minus 14 y plus 32 close paren

6(x−3y+36) 6 times open paren x minus 3 y plus 36 close paren

9(6x−2y+4)

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?