I can't get the right answer for these two, mainly because they include trigonometry and lns.
For the first:
(a)
we want
(b)
we want
Now
Do you know how to find the derivative of ln ?
(c)
I assume the original score is to be taken when
This means the original score is 72
we want to know when does the average score becomes less than
So we must solve for
we want such that:
The second
The rate of change of voltage is
Now, ........By the Chain rule
we want such that
That is, we want to solve
EDIT 1: added and to the solutions
EDIT 2: Thanks for looking out behemoth100...would you believe that I intentionally left the answer incomplete to see if SportfreundeKeaneKent would catch it?
Ok well given that its only 7am in the morning this may be a stupid comment but...
Isnt sin(t) = 0 at 0 pi and 2pi? The interval is 0<t<2pi (except they are equal to or less than signs).
So isn't your answer incomplete?
If I have made a mistake on BASIC DIFFERENTIATION AND TRIG THEN I SHOULD BE SHOT!!! I'm scared agaist going up against the almighty Jhevon