Which statement correctly defines a 'term' in an algebraic expression?

Which pair of terms is a pair of like terms?

Distribute and simplify: 3(2x - 4) - 2(x - 5).

Distribute and simplify this expression with fractions: (1/2)(4x - 6) - (1/3)(3x + 9).

A small business charges setup fee S and per-item cost C. Their combined weekly cost for two product runs is modeled by: 2(S + 3C) - (S - 4C) + 5. Simplify this expression to combine like terms and express the weekly cost in terms of S and C.