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Help as to how to do this chemistry prelab? You can just help me out with b and c, or the whole. btw 15-30-15means 1N,2P,1K? Write the converse of this statement. If 3 - 2x = 13, then x = -5. Converse:? If I get a word problem which tells me to find the angle of depression, would I have to find the inverse trig function, like tan^-1, sin^-1? Probability Question Help? A 30.5 g sample of a compound contains 9.29 g of nitrogen and the rest is oxygen. What is the empirical formula of the compound?