10 points & ! show process : )

in a math class there are five equally weighted tests. a student has grades of
94, 92, 78, and 97 on the first four tests. to earn an a in the class, the students
must have an average of at least 90. what must the student get on the fifth test
to earn an a in the math class?

the student needs at least an 89 on the fifth test to earn an a in the math
class.

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?