15.24 Review of straight lines. During the period after birth, a male white rat gains exactly 39 grams (g) per week. (This rat is unusually regular in his growth, but 39 g per week is a realistic rate.)
(a) If the rat weighed 110 g at birth, give an equation for his weight after weeks. What is the slope of this line?
(b) Draw a graph of this line between birth and 10 weeks of age.
(c) Would you be willing to use this line to predict the rat’s weight at age two years? Do the prediction and think about the reasonableness of the result. (There are 454 grams in a pound. A large cat weighs about 10 pounds.)