Mathematics
Grade10
Easy

Question

Write an exponential decay function for the initial value of 467, decreasing at a rate of 35%.

  1. straight f left parenthesis straight x right parenthesis equals 467 cross times 0.35
  2. straight f left parenthesis straight x right parenthesis equals 467. open parentheses 0.65 close parentheses to the power of straight t
  3. straight f left parenthesis straight x right parenthesis equals fraction numerator 467 over denominator 35 percent sign end fraction
  4. straight f left parenthesis straight x right parenthesis space fraction numerator 35 percent sign over denominator 467 end fraction

The correct answer is: straight f left parenthesis straight x right parenthesis equals 467. open parentheses 0.65 close parentheses to the power of straight t


    The initial amount is 467.
    Rate of increase is 35% or 0.35
    Exponential decay function ⇒ f(x) = 467.(1 - 0.35)t
    f(x) = 467.(0.65)t

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