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X^2-6x-40=0

What is the size of the matrix resulting from

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?