Solve system by substitution method 3x+2y-z=23, y=8, -2y+4z=16 showing step by step this is algebra 2

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

Which of the following is the shape of a cross section of the figure shown below

A50% increase followed by 33 1/2% decrease