A bird takes exactly two minutes to fly linearly from P(3,8,4) to Q(7,4,-3). Assuming that the bird maintains a constant speed, answer each of the following questions. What are the coordinates of the bird's position 45 seconds after leaving P? How many seconds after leaving P does the bird cross the xy-plane?

Let �(�) be the height of a maple tree in inches and � the number of years since 2000. A linear model for the data is �(�)=9.44�+84.182.36912155060708090100110120130140150160170180190200210220A) To the nearest inch, estimate the height of the maple tree in 2012.  inchesB) Use the equation to find the year in which the tree will be 249 inches tall.