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secondary 4 | A Maths
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secondary 4 chevron_right A Maths chevron_right Singapore

Please help with (b)!!! Thanks soo muchh

Date Posted: 1 year ago
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Eric Nicholas K
Eric Nicholas K's answer
5178 answers (Tutor Details)
Differentiating e gives you e again. But there is a chain '-0.3t' to be differentiated.
Eric Nicholas K
Eric Nicholas K
1 year ago
(a) is simply solving an exponential equation for t.

(c) is setting t to a large number so e to the power of -0.3t is a very tiny number.