the diameter of a tree trunk varies directly with the age of a tree. A 45 year old tree has a trunk diameter of 18 inches.Identify the control variable and the dependent variable. Express the variation constant as a rate?
d = ka, where d is the diameter, a is the age, and k is the constant of proportionality.
d is the dependent variable, and a is the control variable.
If a = 45 and d = 18, then
18 = k(45)
18/45 = k
2/5 = k
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