Writing and Evaluating an Expression Write and evaluate the expression. Then, select the correct answer. The sum of forty-five and a number, evaluate when n = 1.1 O 45n, when n = 1.1, the value is 49.5 O 45 + n, when n = 1.1, the value is 46.1 O 45 – n; when n = 1.1, the value is 43.9. o when n = 1.1. the value is 0.024.