- What is a 1 plus in a test for cystis?

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How many grams of H2O are required to react with an excess of P2O5 to obtain a theoretical yield of 147 grams of H3PO4?
P2O5 + 3H2O->2H3PO4? Find the zeros for f(x)= 2(x-3)(x+7)^4 & give the multiplicity. Then state if it touches or crosses x axis, and turns around at each zero.? Where is Brunei Sodium azide decomposes making 2NaNO3->2Na + 3N2. How many grams of N2 can be formed by the decomposition of 130 grams of sodium azide? Divide using long division:
(-28x^2-59x-30) + (-4x -5)
I got an answer of -28x + 6. Can anyone double check if this is correct?