Seven piles of bricks are placed side by side so that their tops form steps 1 brick high. if the lowest pile contains 9 bricks, how many bricks are being used altogether?

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

Which expression is equivalent to? assume x > 0 and y > 0.

Convert 50 kilogram to pounds. (the conversion factor from kilogram to pound is 2.2046.) a. 52.2 lb. b. 110.2 lb. c. 22.6 lb. d. 47.8 lb.