Simplify the expression.
-1/2(-5/6 +1/3)
HELPPPO

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

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How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.