# Thread: Heeeeelp Urgent

1. ## Heeeeelp Urgent

Hey i have a question for Maths B in queensland, australia. Here it is...

Water flows in and out of a tidal pool according to the equation:

g = 50SIN((2π/6)x)

Where g is the flow of water in cubic meters per hour and x is the time in hours. At g=0, the water flow is 0. Greenies who are protesting about water quality begin measuring the flow into and out of the pond 3 hours after g=0. Over a certain period of time approximately 119 cubic metres of water was measured. For how long was the flow measured?

Any help here would be appreciated
Cheers
Ned

2. Originally Posted by Ned Hunter
Hey i have a question for Maths B in queensland, australia. Here it is...

Water flows in and out of a tidal pool according to the equation:

g = 50SIN((2π/6)x)

Where g is the flow of water in cubic meters per hour and x is the time in hours. At g=0, the water flow is 0. Greenies who are protesting about water quality begin measuring the flow into and out of the pond 3 hours after g=0. Over a certain period of time approximately 119 cubic metres of water was measured. For how long was the flow measured?

Any help here would be appreciated
Cheers
Ned
substitute $g = 119$ and solve for $x$

So you need to find $x$ such that:

$119 = 50 \sin \left( \frac {2 \pi}{6}x\right)$

now continue

EDIT: and of course you would have to subtract 3 from the answer above, since they started measuring 3 hours after the flow started