Answer:1 rose bush costs $11.50
1 geranium costs $9.50
Explanation:
4 rose bushes 3 geraniums = $74.50
7 rose bushes 2 geraniums = $99.50
8 rose bushes 6 geraniums = $149
21 rose bushes 6 geraniums = $298.50
13 rose bushes = $149.50
1 rose bush = $11.50
3 geraniums =$74.50-($11.50x4) = $28.50
1 geranium = $9.50