Wider after the boat passes. The wake is the same width as the boat when it first forms, and then it gets wider in proportion to the square root of the distance from the boat. If a 2-meter wide boat passes your
position at 5 m/sec, which domain is appropriate for a function that
models the width of the wake, f(x), and the distance from the boat, x?

a) all numbers greater than 2

b) all rational numbers

c) all positive numbers

d) all numbers greater than 5