Exercices sur les équations 1 1- Résoudre dans ℝ: a) x+3=2 b) -5+x=4 c) -4x=10 d) 3-x=-8x-2 2- Résoudre dans : ℝ a) 13+ 3 2 x=1 b) 3 2 x+ 1 4 = 7 4 c) 2 x−3 7 = x−1 3 3-Résoudre dans : ℝ a) (3x-1)2=0 b) (2x+5)2=9 c) (2x+5)2=3 d) (2x+5)2=-3

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?