Math

Questions 19 and 20 refer to the following information.
Mosteller's formula: 
Current's formula: 
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.

19
Based on Current’s formula, what is w in terms of A?