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.45 of all students buy there lunch in the cafeteria each day. What percent of all students DO NOT buy their lunch in the cafeteria each day.

?Janet , an experienced shipping? clerk, can fill a certain order in 88 hours. Felipe?, a new? clerk, needs 99 hours to do the same job. Working? together, how long will it take them to fill the?...

It's algebra. The original was a simultaneous equation - xy=2 and x+1=y. I substituted the y in and got x^2 + x = 2. I then tried to solve but all I got was x= the square root of (2-x)

Nicolas mixes three solutions of acid with concentrations of 10%, 15%, and 5%. He wants to make 30 L of a mixture that is 12% acid and he uses four times as much of the 15% solution as the 5% solution...

given volume of a bo, its lengt, and width express the height of the box as a function in x. Volume is 12x^3 + 20x^2 - 21x -36, length is 2x + 3, and width is 3x - 4

You have exactly 20 coins, consisting of dimes, nickels and quarters. There are 10 nickels. If the total value of all 20 coins is \$1.95, how many of each coin do you have?

A boat takes 3 hrs to go 24 mi upstream against the current. It can go downstream with the current a distance of 48 mi in the same amount of time. Determine the speed of the boat in still water and...

In a country the number of students who completed high school and enrolled in college that same year increased from 1.4 million in 2002 to 1.9 million in 2006. a) Find an equation for the line...