What is the area of a circle with a radius of 3? Give your answer in terms of π.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?