Two formulas that approximate the dosage of a drug prescribed for children are: Young's Rule: C = 
and Cowling's Rule: C = 
.In each formula, A = the child's age in years, D = an adult dosage, and C = the proper child's dosage. The formulas apply for ages 2 through 13. Use these formulas to solve the problem.For a 6-year old child, what is the difference in the dosage given by Young's Rule and Cowling's Rule? Express the answer as a single rational (or fractional) expression in terms of D.
A. 
D
B. 
D
C. - 
D
D. 
D
Answer: D
Mathematics
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