Acontractor was hired to build an outdoor playpen for a small family dog. the playpen should be square and should have a total area of 200 square feet. how long should the individual sides of the playpen be? (recall that the area of a square is calculated by 2003-04-02-00-00_files/i015.jpg, where l is the length of one side.)

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?