based on the question i am guessing that it is a typo for abc
Answer from: Quest
chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.
Answer from: Quest
triangle eg 7.5 × cos "a" or 7.5 × sin "b" or 6 tan"a"
Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?