Answer:3 in. per yr
Step-by-step explanation:
Present height of Samantha is [tex]40\frac{1}{2}=\frac{81}{2}[/tex]
After next [tex]5\frac{1}{2} years i.e. \frac{11}{2} years[/tex]
she grew to [tex]57\ inches[/tex]
Increase in her height[tex]=57-\frac{81}{2}=16.5\ inches[/tex]
Increase in height per year is [tex]=\frac{16.5}{5.5}=3\ in.\ per\ year[/tex]
