The expression 3.49c + 2.99m represents the total cost of both the marker and crayons.
One box of crayon = $3.49
One box of markers = $2.99
The number of boxes of crayons bought by the teacher = c
The number of boxes of markers bought by the teacher = m
3.49c and 2.99m represent the amount the teacher spent on both crayons and markers.
Therefore, the addition of 3.49c + 2.99m gives the total cost of both the marker and crayons.
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