1) which ordered pair is the solution to the system of equations?
{x+y=−13x−y=21
(5.5, −6.5)
(10, −11)
(5, −6)
(7, −8)

Find the slope of the line y =8/9x + 1.

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

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?