Question on: JAMB Mathematics - 2009

If s = (2 + 3t)(5t - 4), find \(\frac{dy}{dx}\) when t = \(\frac{4}{5}\) sec
A
0 units per sec.
B
15 units per seconds
C
22 units per seconds
D
26 units per seconds
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Correct Option: C
s = (2 + 3t)(5t - 4), find \(\frac{dy}{dx}\) when t = \(\frac{4}{5}\) sec

= 10t - 8 + 15t2 - 12t

\(\frac{ds}{dt}\) = 15t2 - 2t - 8

= 30t - 2 ; t = \(\frac{4}{5}\)

= 30t - 2

= 30 x \(\frac{4}{5}\) - 2 \(\to\) 24 - 2

= 22 sec

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