A construction company uses two different-sized trucks to deliver sand. The first truck can transport x cubic yards of sand. The second truck is smaller; it can only transport y cubic yards of sand. The first truck made 9 deliveries to a job site on Tuesday, while the second truck made 3 deliveries on Tuesday. For each quantity described below, write an expression using the variables x and y that represents the quantity. For example, if the problem asked for "the total cubic yards of sand transported by the first truck on Tuesday", you might write "9x". The total cubic yards of sand delivered by the two trucks combined on Tuesday = How many more cubic yards of sand the first truck can transport per delivery than the second = The average number of cubic yards the two trucks can transport =

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