Your head gets larger as you grow. Most of the growth comes in the first few years of life, and there is very little additional growth after you reach adolescence. The estimated percentage of adult size for your head is given by the formula y = 100 - 80(0.75)x, where x is your age in years and y is the percentage of the average adult size.
a. Graph this function.
b. What are the reasonable domain and range of this function?
c. Describe the transformations of the graph of y = (0.75)x that produce the graph in 9a.
d. A 2-year-old child's head is what percentage of the adult size?
e. About how old would a person be if his or her head circumference is 75% that of an average adult?