Solve the Problem $d ( x ) = \frac { D x } { x + 12 } , 0 \leq x \leq 12$

question 308

Multiple Choice

Solve the problem.
-To calculate the drug dosage for a child, a pharmacist may use the formula $d ( x ) = \frac { D x } { x + 12 } , 0 \leq x \leq 12$ .
The child's age is $x$ and the adult dosage is D. What is the dosage for an 4 -year old child if the adult dosage is $90 \mathrm { mg }$ ? (Round to the nearest tenth.)

• A) \(5.6 \mathrm { mg }\)
• B) \(22.5 \mathrm { mg }\)
• C) \(30.0 \mathrm { mg }\)
• D) \(90.0 \mathrm { mg }\)

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