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4. First, let's change all of the mixed fractions into improper fractions.

3 5/6 - 1 4/5 = 23/6 - 9/5

We can't subtract yet since the denominators aren't equal, so we have to find a common multiple, which is 30.

23*5/6*5 - 9*6/5*6 = 115/30 - 54/30 = 61/30

5. For this question, it might be easier to convert the fractions into decimal.

Marty weighs 64.25 pounds, and Nathan weighs 76.5

76.5-64.25 = 12.25

Nathan weighs 12.25 more pounds.

people went from manufacturing one object at a time by hand to manufacturing many objects in factories

did you get the answer yet?

step-by-step explanation: