Question 840296
Correct is 8.3 + x. You are just adding three terms and since addition is commutative and associative, it does not matter what order you add. A more thorough solution:


3.2 + (x + 5.1) = 3.2 + (5.1 + x) (by commutativity)
= (3.2 + 5.1) + x (by associativity)
= 8.3 + x