- Is there a good website that helps with all kinds of math/algebra?

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How can i determine crop coefficient of constructed wetland macrophytes? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr? Is three days enough to study for a calculous test? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room?