SOLUTION: USE A PROPORTION TO SOLVE THE PROBLEM ABOUT DIRECT VARIATION. A person's hair length varies directly with the number of weeks it has been growing. If Fred shaved his head bald and

Question 135261: USE A PROPORTION TO SOLVE THE PROBLEM ABOUT DIRECT VARIATION.
A person's hair length varies directly with the number of weeks it has been growing. If Fred shaved his head bald and his hair was 0.15 inches long after 5 weeks, how long would it be afteran additional 4 weeks? Round to the nearest hundredth of an inch.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A person's hair length varies directly with the number of weeks it has been growing. If Fred shaved his head bald and his hair was 0.15 inches long after 5 weeks, how long would it be after an additional 4 weeks? Round to the nearest hundredth of an inch.
---------------------------------
length = k*weeks
0.15 = k*5
k = 0.03
length = 0.03*weeks
--------------------------
length = 0.03*10
length = 0.3 inches
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OR, using proportions:
x/10 = 0.15/5
x = 10(0.15/5)
x = 1.5/5 = 0.3 inches
========================
Cheers,
Stan H.
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