A professional dog walker charges by the hour and also by the size (weight) of the dog. The prices are defined by the piecewise function, where h is the number of hours, and w is the weight of the dog. 9h. f(x)=11h, WS 15 15 40 What is the price for a 42-pound dog if the dog is walked for 1.5 hours? A $12.50 B $18.50 C $18.75 D $63.00