Solve the problem.The revenue achieved by selling x graphing calculators is figured to be The cost of each calculator is How many graphing calculators must be sold to make a profit (revenue - cost) of at least $160.00?

A. {x ? 22 < x < 38}
B. {x ? 20 < x < 40}
C. {x ? 5 < x < 25}
D. {x ? 21 < x < 19}

Answer: B

Mathematics

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Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.The following graph shows that more and more people in a certain country are moving from urban cities to the suburbs. The percent, p, of the population living in urban cities can be estimated by the equation and the percent of the population living in the suburbs by the equation In both equations, t represents the number of years since 2000. That is,

/> corresponds to 2000, corresponds to 2001, and so on. Assuming this trend continues, use both equations to estimate the year in which the percent of the population of this certain country living in urban cities will be equal to the percent living in the suburbs.

A. 2015
B. 2011
C. 2013
D. 2019