Q: When a solution set to a real world problem involving polynomials contains both positive and negative solutions why are the negative solutions often discarded?

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Because in real world problems, you cannot have answers such as "-3 people", "-4.56 minutes", "a shoe size of -9" etc... It is not logical.

It is an expression and if it contains an equality sign then it is an equation.

The question contains an algebraic expression but, since there is no equality sign, there is no equation to solve.

If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.

A. In a box of letters, there are 3x's, 4y's, and 13 z's. In a second box, there are 7 x's, 15 y's, and 2 z's. The contents of the two boxes are put together in a third box which already contains 2 x's, 3 y's, and 8 z's. What are the final contents of the third box?SOLUTION:The contents of the first box can be expressed as3x + 4y + 13zThe contents of the second box can be expressed as7x + 15y + 2zThe contents of the third box can be expressed as2x + 3y + 8zIf the contents of the first two boxes are put together in the third box, the final contents of the third box can be expressed as the sum of the three expressions above. So, we have3x + 4y + 13z7x + 15y + 2z+2x + 3y + 8z__________________ 12x + 22y + 23zTherefore, the final contents of the third box are 12 x's, 22 y's, and 23 z's.

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Because in real world problems, you cannot have answers such as "-3 people", "-4.56 minutes", "a shoe size of -9" etc... It is not logical.

An expression which contains polynomials in both the numerator and denominator.

rational expression

rational expression

Saturated.

The usage of polynomials in real life include mathematical models for the stock market, roller coaster designs, rocket trajectories, and in engineering for high and machine designs. A polynomial is a mathematical expression that contains exponents, variables, and constants.

nutrients. Soil contains nutrients that are essential for plant growth and development, much like how trash contains refuse that is discarded and no longer wanted.

this is because isotonic solutions are fluids that contains the same concentration of solutes as plasma in human..(*_*) that's what i think..._pinkay

Because these solutions contains electrically charged particles - ions.

Water in oceans always contains solutes.

dilute .......................................... If you are using A+ ,, The answer is Concentrated...

It is an expression and if it contains an equality sign then it is an equation.