How much sand would you need to fill this box ?

Place the following steps in order to complete the square and solve the quadratic equation,

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

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