The angle of elevation of the sun has a measure of 66 degrees. A flagpole casts a shadow 15 feet long. Find the height of the pole?

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

3x + 4y = 5 x- 3y = -7 solve by substitution