$\"\"$

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The exponential decay function is $\"\"$ .

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The initial amount of sucrose is $\"\"$ .

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decomposes to $\"\"$ in $\"\"$ minutes.

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Hence, $\"\"$ and $\"\"$ .

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Substitute all the values in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

\

Therefore,the decay constant is $\"\"$

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$\"\"$

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The equation is $\"\"$ .

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Find the amount of sucrose will remain after two hours.

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Substitute $\"\"$ and $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

\

Therefore,the amount of sucrose level reaches $\"\"$ after two hours.

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$\"\"$

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Fid the time to reach sucrose level to $\"\"$ .

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Substitute $\"\"$ and $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, the amount of sucrose level reaches $\"\"$ after $\"\"$ .

\

$\"\"$

\

The amount of sucrose level reaches $\"\"$ after two hours.

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The amount of sucrose level reaches $\"\"$ after $\"\"$ .