Jim is showing his work in simplifying (−8.5 + 6.1) − 1.3. Step 1: (6.1 − 8.5) − 1.3
Step 2: 6.1 − (8.5 + 1.3)
Step 3: 6.1 − (9.8)
Step 4: 1.1

Which statement is true?
In step 1, Jim used the associative property.
In step 2, Jim used the distributive property.
In step 3, Jim used the commutative property.
In step 4, Jim's answer is incorrect.

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?