4). (2 points each) Evaluate these expressions for: a = 4, b = 3, c = 2 Rewrite the expressions with numbers first. a). a - b = ___________ = _____ b). b - a = ___________ = _____ c). a b c = ___________ = _____ d). (a b)/ c = ___________ = _____ e). (a + b) c = ___________ = _____ f). a + (b c) = ___________ = _____ 5). (2 points each) Evaluate these expressions for: a = + 3, b = - 4, c = + 9 a). = _________ b). b c/ a = ___________ = ____ c). a - b = ____________ = ____ d). a c b = ____________ = ____ e). 4 b - c = ____________ = ____ f). 6 a + 4 b = ____________ = ____