Given the function f(x) = -x² + 8x + 9, state whether the vertex represents a maximum or minimum point for the function. What about the quadratic function the way it is written indicates if it is a maximum or a minimum? Explain your answer.

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18