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Math Help - sat prep problem 7

  1. #1
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    sat prep problem 7

    ok so here we go....

    the problem states the following...

    S(L)= 3L -20.5

    the function s defined above can be used to approximate a womans shoe size in the united states, where L is the womans foot length in inches. according to this function, which of the following best approximates the shoe size of a woman whose foot length is 9.3 inches.

    a. 5.5
    b. 6
    c. 6.5
    d. 7
    e. 7.5


    ok well 9.3 inches is approx .779 ft or something like that. when i plugged 7 in the problem i got .5 ft and when i plugged in 7.5 i got 2 ft. so i chose d, and said that 7 is closest to the womans foot. of course the book says im wrong, im just not understanding why, the error with 7 is smaller then with 7.5...


    thanks in advance.


    note this problem came from the may 2011 sat test section 4 problem 7.
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  2. #2
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    Re: sat prep problem 7

    3(9.3)-20.5=7.4\approx 7.5
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  3. #3
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    Re: sat prep problem 7

    thanks i read it wrong....sorry to have wasted your time.
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