Allometric relations often can be modeled by f(x)= x^b, where a and b are constants. One study showed that for a male fiddler crab weighing over 0.75 gram, the weight of its claws can be estimated by f(x)= 0.448 x^1.21. The input x is the weight of the crab in grams, and the output f(x) is the weight of the claws in grams.

(a) Predict the weight of the claws of a 2-gram crab
(b) Approximate the weight of a crab that has 0.5-gram claws