Answer:
The percent increase is 10%
Step-by-step explanation:
Percentage increase = 
in this case we have;
((33-30)/30)*100%
(3/30)*100= 10%
The half life of the substance is 6.92 days.
<h3>What is the Half life ?</h3>
Half life can be defined as the time required to reduce the concentration to half of its initial value.
Here the equation given is

The concentration will reduce to half therefore

so,

ln 0.5 = - 0.1001 * t(1/2)
-0.693 = -.1001 * t(1/2)
t(1/2) = 6.92 days.
Therefore the half life of the substance is 6.92 days.
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Answer:
i think its b but im not that sure
Step-by-step explanation: