What is the relationship between two lines in the plane that intersect to form right angles?

If the table of the function contains exactly two potential turning points, one with an input value of –1, which statement best describes all possible values of m? m ≥ –12 –12 < m < 4 m ≤ 4 m ≥ 4 or m ≤ –12

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?