1-3. (5 points) Let c=(1,8,9,6)Tc = (1,8,9,6)^Tc=(1,8,9,6)T. Find the vector w∈span{(1,1,1,1)T}w \in \text{span}\{(1,1,1,1)^T\}w∈span{(1,1,1,1)T} such that ∥w−c∥\|w-c\|∥w−c∥ is minimized.
