Verified answer

Growth rate is 2.72 in/year

Explanation:

Step 1: Enumerate the given values.

Given:

H1 = 20 in

H2 = 5 ft 9 in = 5 ft(12 in/ft) + 9 in = 69 in

n = 18 yrs

Step 2: Identify what is being asked.

Required:

Average growth rate

Step 3: Solve for Average growth rate

Equation:

The formula for Growth rate is given by:

where: Gr - Growth rate

H1 - height n years ago

H2 - present height

n - number of years

Solution:

Substituting the value of H1 ,H2 and n in the formula,

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