A squirrel is on top of a tree that is 20 feet tall. The squirrel looks down at an acorn on the ground. It is looking down at an angle of depression of 45 degrees. How far is the acorn from the tree?

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?