What must be multiplied to this fraction to Rationalize the Denominator:
9-sqrt7/4+sqrt2

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Solve the triangle. a = 21°, c = 105°, c = 5

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.