The relationship between the height H of an adult male and the length x of his humerus, in centimeters, can be modeled by the linear function H(x) = 2.89x + 78.10.

(a) If incomplete skeletal remains of an adult male include a humerus measuring 37.1 centimeters, approximate the height of this male to the nearest tenth. 

(b) If an adult male is 175.3 centimeters tall, approximate the length of his humerus to the nearest tenth.