How many square shingles for 16'x20' roof?

What is the best tile to use to surround a tub? What have at least two congruent two parallel bases? How much is the average cost per square foot in building a house in Georgia? What is the value of y in the mod 9 system 5 x y equals 4? Why is the plane figure a polygon? Determine the measure of the angle that is the supplement of 53 degree? A CD has a radius of 6 cm Which is its diameter? What are facts about a cylinder? When the net is folded into the rectangular prism shown beside it which letters will be on the front and bottom of the rectangular prism? What is the circumference of a 48 inch circle? What is a flattened circle or oval? The number feared by Pythagoreans since it lies halfway between the only integers that can be both the perimeter and the area of the same rectangle? Is a parallelogram always a quadrilateral? Does the centroid of a lamina coincides with the intersection of the diagonals of a rectangle? A prism has lateral faces that are perpendicular to the two bases? How many 12x12 patio tiles covers 36 square feet? What is the area of a rectangle with a length of x 3 and a width of 7? What is the area directly below the roof line where windows are found called? Find the perimeter of an equilateral triangle that has a base side of 4 inches? How many square yards to a square foot?