I need some help with this calculus 1 question

At which value in the domain does f(x) =0?

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn. if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

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