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spayn [35]
3 years ago
5

Penolope earned $50 in may then she earned $60 in june

Mathematics
1 answer:
Anit [1.1K]3 years ago
7 0

Answer:

You are correct, it is 20% increase as:

(60/50) - 1 = 0.2 = 20%

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The question is:
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f(x) = \sqrt{x+1} \\ y = \sqrt{x+1} \ or \ y^2 = x+1 \ or \ x = y^2 - 1 \\ Therefore, \ f^{-1}(x)=x^2 - 1

(fof^{-1})(a) = f(f^{-1}(a))=f(a^2-1) \\ =\sqrt{a^2-1+1}=\sqrt{a^2}=a \\  \\ (f^{-1}of)(a)=f^{-1}(f(a))=f^{-1}(\sqrt{a+1})= \\ (\sqrt{a+1})^2-1 = a+1-1 = a

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