What four elements have chemical properties most similar to fluorine's(atoms number 9)

100 points, hi, i’m not sure how to get the equation from the graph and table.

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3