Eight more than one third of a number is no more than 23

Evaluate cos2θ for cosθ = square root of 3/2

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels