The height of the bamboo plant after 15 days is 316 inches.
In order to determine the formula that represents the rate of growth of the bamboo plant, we have to determine the inches of growth per day.
Rate of growth per day = 134 - 121 = 13 inches
The height of the bamboo plant = 121 + 13h
Where h is the number of days
Height in 15 days = = 121 + (13 x 15)
= 316 inches
To learn more about linear functions, please check: https://brainly.com/question/26434260