A linear program is infeasible if there exists no solution that satisfies all of the constraints -- in other words, if no feasible solution can be constructed.
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a trivial solution is one in which all the unknown are equal to zero.. Of course this only occurs in homogeneous equations
"Infeasible". (Only one equation needs to not "fit" with another for infeasibility, regardless of whether all the others correspond). Possibly the equations result in lines parallel to one another (hence there is no point that will satisfy all of them). However before reaching that conclusion it's better to check the calculations that you've done, just to check for errors.
I dont think there are 2 numbers. If you meant -10, there's a solution. -5 and 2
These questions are meant to be used as a school-wide exercise. Your teacher should explain the solution after everyone has had a chance to solve it.
This is (mass of solute) divided by (mass of total solution) expressed as a percentage. The solute is what you are dissolving into the solution. Example: you have 90 grams of water, and you add 10 grams of salt (sodium chloride). The water is the solvent, sodium chloride is the solute, and the solution is salt water. 90 grams + 10 grams = 100 grams (mass of total solution). (10 grams) / (100 grams) = 0.1 --> 10% mass mass percent concentration.