Find height of triangle in a 45-45-90 triangle knowing one side

Find the value of the cosine for angle a

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

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