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The given function k is a composition of two functions m and n so that k(x) = (m ∘ n)(x). k (x) = startfraction 2 over rootindex 4 startroot 4 x minus 7 endroot endfraction if n(x) = 4x â€" 7, m(x) must be equal to which expression? 2 startroot x endroot x rootindex 4 startroot x endroot startfraction 2 over startroot x endroot startfraction 2 over rootindex 4 startroot x endroot endfraction