Helen has been working on a science project about plant growth. plant a started at a height of 6 cm and exhibited steady growth during the first four weeks of the project. after those four weeks, plant a was 26.8 cm in height. in a linear model of plant a's growth, x represents the number of weeks after being planted, and y represents the plant's height [in cm]. relative to this model, which of the following statements applies? a. an additional 8.2 weeks of growth is associated with an additional centimeter of plant height. b. an additional week of growth is associated with an additional 8.2 cm of plant height. c. an additional 5.2 weeks of growth is associated with an additional centimeter of plant height. d. an additional week of growth is associated with an additional 5.2 cm of plant height.