luke is completing a science experiment at home. he bought two hibiscus plants for his experiment. one of the plants was 5 cm tall. each week he measuared and recorded the hieght of the plant,H, in cm. after collecting data for several weeks, he determined that the height of the plants, H, in cm, could be represented by the function H(t)=5+0.5t , where T is the number of weeks since he purchased the plant. what is the value of H(4)