Unit Test Answers

A chemist has 200 mL of a 10% sucrose solution. If she adds x milliliters of a 40% sucrose solution, what is the percent concentration of the final mixture?Which expression represents the total mass, in grams, of sucrose in the final mixture?

Which expression represents the total volume, in milliliters, of the final mixture?

In the long run, the cost of the refrigerator modeled by will be the cheapest, averaging $ per year.

Which function represents the percent concentration, y, of the final mixture?

A refrigerator costs $850. The estimated yearly operating cost of the refrigerator is $62.Average annual cost = Purchase price + Total operating cost Number of yearsWhich expression represents the total cost, in dollars, of owning the refrigerator for x years?

Question text not available

After how many years will the average annual cost of the two refrigerators be equal?