Tom is showing his work in simplifying (5.2 - 8.5) - 0.5 + 6.8. in which step did tom make an error? step 1: : (5.2 - 8.5) - 0.5 + 6.8 step 2: 5.2 + (-8.5 - 0.5) + 6.8 (distributive property) step 3: 5.2 - 9 + 6.8 step 4: 5.2 + 6.8 - 9 (commutative property) step 5: 12 - 9 = 3 — step 2; he wrote distributive instead of commutative step 2; he wrote distributive instead of associative step 4; he wrote commutative instead of associative step 4; he wrote commutative instead of distributive