Originally Posted by

**rosspetrie** First post so bear with me if they dont come out right :-)

Im not too sure about the working, i have done this just now and came up with 30.375, the steps i have taken are a bit confusing though.

Thanks very much to anyone who gives me a hand.

1. Calculate at t=4

$\displaystyle \frac{4t- 2t^2 +5t - 6}{t} $

2. Calculate when t= 0.01sec

for this i ended up with 3.1354

$\displaystyle 0.5\cos(2\pi t - \frac {\pi}{2}) $

I have a few others but any help with these would be greatly appreciated