Reference angle for 11pi/4

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.