$\"\"$

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The function is $\"\"$

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$\"\"$ (Apply the derivative) \ \

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$\"\"$ (The derivative sum rule)

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$\"\"$ (The derivative of constant is zero)

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$\"\"$ (Inner derivative of $\"\"$ )

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$\"\"$ (The derivative of constant is zero)

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$\"\"$ (y\\' = m and substitute x = 25)

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$\"\"$

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$\"\"$ . ( $\"\"$ )

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$\"\"$

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Therefore the slope is $\"\"$ .