find the area of the triangle bounded by the y-axis, the line f(x)=9-6/7x and the line perpendicular to it that passes through the orgin

This is so hard and it’s for a test

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 graph: .

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?