- Hi can someone answer these log and exponents questions?

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Solving differential equation: x√(1+y^2) +y√(1+x^2) dy/dx = 0 if it is known that in addition y(0)=0.? If y = x/(x+a) where a is constant, then is x proportional to y? The formula given is:
4 NH3 + 5 O2 - 4 NO + 6 H2O How many oxygen atoms are there in 15.00 grams of NO? give the answer in moles...
Thanks? What is the formula weight of iron(III) sul- fite? How come some nights the moon is low in the east & other nights it's low in the west??