SAT Math Practice Question
$$.\begin{aligned}.& \text { Mosteller's formula: } A=\frac{\sqrt{h w}}{60} \\.& \text { Current's formula: } A=\frac{4+w}{30}.\end{aligned}.$$.The formulas above are used in medicine to estimate the body surface area $A$, in square meters, of infants and children whose weight $w$ ranges between 3 and 30 kilograms and whose height $h$ is measured in centimeters. Based on Current's formula, what is $w$ in terms of $A$ ?
- A.$w=30 A-4$
- B.$w=30 A+4$
- C.$w=30(A-4)$
- D.$w=30(A+4)$
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