Question

doctors use the rational expression given below to determine the dosage of a drug prescribed for children. in this expression, a = the childs age and d = the adult dosage. if the normal adult dosage of medication is 1100 milligrams, what dosage should a 3 - year - old child receive? use the expression to solve.
\\(\frac{da}{a + 12}\\)
a 3 - year - old child should receive milligrams of the drug.

Explanation:

Step1: Identify values of A and D

$A = 3$, $D=1100$

Step2: Substitute values into formula

$\frac{DA}{A + 12}=\frac{1100\times3}{3 + 12}$

Step3: Calculate numerator and denominator

Numerator: $1100\times3 = 3300$, Denominator: $3+12=15$

Step4: Calculate the fraction value

$\frac{3300}{15}=220$

Answer:

220