How do I solve this special right triangle?

If n-9 is an even number what are the next three consecutive intergers

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 inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4