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A mine extracts 2 metric tons of coal in an hour. The mine uses   ton of the extracted coal every hour to generate electricity for the mine and sells the rest. If t is the number of hours spent mining, which expression represents the amount of ore sold? How much ore can the mine sell after extracting ore for 12 hours?

Respuesta :

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The expression is 2t−1/4t. The amount of ore is 21 metric tons.
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Answer:

a. 2.2t-1/4t=X

b. X=23.4 tons

Step-by-step explanation:

A mine extracts 2 metric tons of coal in an hour. The mine uses 1/4  ton of the extracted coal every hour to generate electricity for the mine and sells the rest. If t is the number of hours spent mining, which expression represents the amount of ore sold? How much ore can the mine sell after extracting ore for 12 hours?

convert 2 metric tons to ton

2.2 tons/t hr

from the question

let time be t in hr

2.2t-1/4t=X

X=the amount sold

How much ore can the mine sell after extracting ore for 12 hours?

substituing the value of t into the equation

2.2*12-0.25*12

X=23.4 tons

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