The relationship between the height H of an adult female and the length x of her femur, in centimeters, can be modeled by the linear function H(x) = 2.47x + 54.10.

(a) If incomplete skeletal remains of an adult female include a femur measuring 46.8 centimeters, approximate the height of this female to the nearest tenth. 

(b) If an adult female is 152.4 centimeters tall, approximate the length of her femur to the nearest tenth.