Rico and his friend eat lasagna. Rico eats 1/9 of the lasagna, and his friend eats 1/18 of the lasagna. How much of the lasagna is left? (20 points for this one!)

Can someone explain the elimination method to me for this problem?

The measure of an angle is 117°. what is the measure of a supplementary angle?

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