6th grade math i mark as brainliest

Can someone me with my hwplz(only the circled ones)

If the measure of xyz is 81 what is the measure of yz

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at link to the chart is here