How can I learn to do algebra

Find the vertex of the function given below y=x^2-6x+1

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

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9