Asound wave has a frequency of 425hz. what is the period of this wave? a) 0.00235 b) 0.807 c) 425 d) 850

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k