Identify whether each of the following is best described as a fixed, variable, or mixed cost with respect to product units

$\backslash$table$[[1.$ Peanuts used in making trail mix.$],[2.$ Taxes on factory building.$],[3.$ Real estate taxes.$],[4.$ Rubber used to manufacture athletic shoes.$],[5.$ Rubber used in making tennis balls.$],[6.$ Depreciation expense on equipment $($straight$-$line$).],[7.$ Salesperson salary plus commission.$]]$