A 12 x 2 cm rectangle sits inside a circle with the radius of 8 cm. What is the area of the shaded regions.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

Percent increase and decrease. original number: 45 new number: 18