document.write( "Question 163212: can someone show me how to do this problem:\r \n" );
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document.write( "Write a cost function for the problem. Assume that the relationship is linear. \r \n" );
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document.write( "A cab company charges a base rate of $1.50 plus 15 cents per minute. Let C(x) be the cost in dollars of using the cab for x minutes.\r \n" );
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document.write( "a. C(x) = 1.50x + 0.15 \n" );
document.write( "b. C(x) = 1.50x - 0.15 \n" );
document.write( "c. C(x) = 0.15x - 1.50 \n" );
document.write( "d. C(x) = 0.15x + 1.50\r \n" );
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document.write( "Note, the base rate of $1.50 is constant; it will not change whether you use the phone 1 second or 100 minutes, so there should be no variable (in math represented by a letter) next to it.....This makes A and B wrong.\r \n" );
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document.write( "The amount that will vary depending on how many minutes you use is the 15 cents which in money is represented as $0.15.....note this amount is per minute so to find how much it would be for x number of minutes you multiply $0.15x\r \n" );
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document.write( "Final answer: \n" );
document.write( "C(x)=0.15x + 1.50\r \n" );
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document.write( "Why is c wrong? Because C is assuming we are deducting or taking away $1.50 this would only be true if our problem had stated this was a discount, saving, deduction, etc....but our prolbem said this was a base amount (amount that must be paid regardless, kind of like your phone plan....where you pay an specific amount regardless of whether you use call any one or not....)\r \n" );
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document.write( "ANSWER; D \n" );
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