John and brian work for a toy manufacturers putting stuffing in teddy bears. on average, john can stuff x teddy bears in one day and brian can stuff y in one day. they both the same number of days, t. what does the expression (x +y)t represent? a. the number of teddy bears john can stuff in t days b. the number of teddy bears brian can stuff in t days c. the number of teddy bears john and brian can stuff in t days d. the number of teddy bears john and brian can stuff in one day