If one pump can empty a flooded basement in 18 hours, and a second pump can empty the basement in 20 hours, how long will it take to empty the basement when both pumps are used?

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.