Bahira is determining what happens to the quadratic equation y 15% + 8x + 3 If the 1 is changed to -1. Which of the following best describes the effect?
A) changes the quadratic to concave down
B) changes the quadratic to concave up
C) moves the y-intercept up 2 units
D) moves the y-intercept down 2 units

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?