Can some one help me with this question. I need to know the value of "x" but I can't figure it out.

We must first determine the shape of a rectangular prisms _ a0 to find area of the prism

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?