F (x)=-1/3 x+7 determine the input that would give an output value of 2/3

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

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?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me