64 mi/h to ft/s HELP HELP HELP HELP NOW

64 mi/h = 93.9 ft/s I have the answer guide

Formatting first:

Step 1: (6.2 − 1.6) − 4.4 + 7.8

Step 2: 6.2 + (− 1.6 − 4.4) + 7.8 (commutative property)

Step 3: 6.2 − 6 + 7.8

Step 4: −14 − 6 = 8 (commutative property)

Step 5: 14 − 6 = 8

Step 2 is the associative property (a+b)+c=a+(b+c)

Step 4 is just wrong with -14 instead of 14; seems corrected in step 5.

He wrote commutative instead of associative in Step 2.