Which expression is a polynomial in (m)?

Correct answer: \(2m^5-3m+1\)

In \(2m^5-3m+1\), the powers of \(m\) are \(5\), \(1\), and \(0\), all of which are non-negative integers. Hence, it is a polynomial in \(m\). In option A, \(1/m=m^{-1}\); option B has a negative exponent; and option D has \(\sqrt{m}=m^{1/2}\). These are not polynomials. Exam tip: powers of the variable in a polynomial must be \(0,1,2,\ldots\).