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Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Robert has 78 tomatoes and 56 cucumbers he wants to plant them in equal rows how many in each row