How do you write f(x)=|x-7| as a piece wise function

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0