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    Mathematics
    Grade10
    Easy

    Question

    A sporting goods store is running a summer sale on its surfboard. Kayden is interested in a surfboard. The store is offering a $50 instant rebate, as well as a 10% discount. Write functions to model the discounts., if $ 50 instant rebate is applied and then 10% discount on it, then identify the function.

    1. 0.9x + 4.5
    2. 0.9x - 4.5
    3. 0.9x - 45
    4. 0.9x + 45

    The correct answer is: 0.9x - 45

      Since f(x) = x - 50 and g(x) = 0.9x
      (g x f) (x) = g(f(x)) = g(x - 50) = 0.9 × (x - 50) = 0.9x - 45

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