Answer: 22.5
Explanation:
If the plants continue to grow 1.5 inches each week, the height of each plant after 15 weeks can be found by multiplying the growth per week by the number of weeks:
Height of each plant = Growth per week × Number of weeks
Hence, the Height of each plant = 1.5 × 15
Height of each plant = 22.5 inches
Therefore, each plant will be 22.5 inches tall after 15 weeks if they continue to grow 1.5 inches each week.