From data adapted from the National Center for Health Statistics, the height H in inches and age

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From data adapted from the National Center for Health Statistics, the height H in inches and age A in years for boys between 4 and 16 years of age are related according to
H = 2.31A + 31.26
To account for normal variability among boys, normal height for a given age is ( 5% of the height obtained from the equation.
(a) Find the normal height range for a boy who is 10.5 years old, and write it as an inequality.
(b) Find the normal height range for a boy who is 5.75 years old, and write it as an inequality?
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