How do you work out this problem 2.9n 1.7 3.5 2.3n?

To work out the expression (2.9n + 1.7 + 3.5 + 2.3n), first combine like terms. The terms involving (n) are (2.9n) and (2.3n), which add up to (5.2n). The constant terms (1.7) and (3.5) combine to (5.2). Therefore, the simplified expression is (5.2n + 5.2).