20 points which expressions are equivalent to −7b(3−c)? select each correct answer. 21bc -4b + 7c -7b - 21bc -21bc + 7bc (-7b * 3) + (7b * c) which expressions are equivalent to this expression? 3(n - 4) select each correct answer. 3n + 12 2n - 12 + n -12 + n + n + n 3n - 4