Write a system: gerard bought 9 hamburgers and 3 orders of fries for $24.75. chris bought 6 hamburgers and 4 orders of fries for $19.50. each hamburger costs the same amount. each order of fries costs the same amount. write a system of linear equations that can be used to find how much one hamburger (h) cost and one order of fries (f) cost. what is the cost, in dollars, for each item?

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?