The length of a rectangle is 4 units more than its width. the area of the rectangle is 25 more than 4 times the width. what is the width of the rectangle?
a. 9
b. -5
c. 3
d. 5

Could somebody me with this radical simplification?

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.

What is the equation of a line that passes through points (0, 4) and (-4,-8)?