$\"\"$

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(a)

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Total number of flowers are $\"\"$ .

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Let $\"\"$ be the number of lilies and $\"\"$ be the number of hydrangea.

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$\"\"$

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$\"\"$ .

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Total cost of flowers $\"\"$ .

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Substitute $\"\"$ into $\"\"$

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$\"\"$

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$\"\"$

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Total cost of the flowers $\"\"$ .

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$\"\"$

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(b)

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Find the inverse of the function, consider $\"\"$ and solve $\"\"$ in terms of $\"\"$ .

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$\"\"$

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$\"\"$

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Interchange $\"\"$ and $\"\"$ .

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$\"\"$ .

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Replace $\"\"$ .

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$\"\"$

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The inverse of $\"\"$ is $\"\"$ .

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$\"\"$ represents the number of lilies flowers.

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$\"\"$ represents the total cost of flowers.

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$\"\"$

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(c)

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Cost function $\"\"$ .

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Inverse function is $\"\"$ .

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The total cost of the function always should be positive.

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The domain of the cost function $\"\"$ is $\"\"$ .

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The range of the cost function $\"\"$ is $\"\"$ .

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The domain of the inverse function $\"\"$ is the range of the function $\"\"$ .

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The domain of inverse function $\"\"$ is $\"\"$ .

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$\"\"$

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(d)

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The function $\"\"$ .

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Total cost of flowers is $\"\"$ .

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Total no.of lillies $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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(a).

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Total cost of the flowers $\"\"$ .

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(b).

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The inverse of $\"\"$ is $\"\"$ .

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$\"\"$ represents the number of lilies flowers.

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$\"\"$ represents the total cost of flowers.

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(c).

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The domain of the cost function $\"\"$ is $\"\"$ .

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The domain of Inverse function $\"\"$ is $\"\"$ .

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(d).

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Total no.of lillies $\"\"$ .