A student has grades of 89, 96, 88,and 90 on four of the five unit tests in a course.Let x represent the grade on the fifth test. This must be a...

A student has grades of 89, 96, 88,and 90 on four of the five unit tests in a course.Let x represent the grade on the fifth test. This must be a whole number. An average of more than 90 is desired.

a) Using this information, write on a inequality using x to represent the fifth test.

b) Solve the inequality.

c) What is the lowest grade the student needs in order to have an average of more than 90?