Question

Eva is showing her work in simplifying (7.3 – 7.2) – 3.8 + 3.7. In which step did Eva make an error?

Step 1: (7.3 – 7.2) – 3.8 + 3.7

Step 2: 7.3 + (–7.2 – 3.8) + 3.7 (commutative property)

Step 3: 7.3 – 11 + 3.7

Step 4: 7.3 + 3.7 – 11 (commutative property)

Step 5: 11 – 11 = 0

Answer 1

Step 2; she wrote commutative instead of distributive
Step 4; she wrote commutative instead of distributive
Step 4; she wrote commutative instead of associative
Step 2; she wrote commutative instead of associative

Answer 2

I am really stuck on this one :/

Answer 3

It is not distributive property since it works from the outside to the inside of the parenthesis si it is between C and D and I think D sounds more logical but is definitely between C or D

Answer 4

Not too sure :/

Answer 5

Step 2; she wrote commutative instead of associative