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Name the most appropriate metric unit for each measurement like a length of an carrot

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?