A Metal Bar Is Heated and Then Placed on a Workbench

question 13

Multiple Choice

A metal bar is heated and then placed on a workbench for bending.The temperature B, in degrees Fahrenheit, t minutes after heat is applied is given by . ​
The bar can be worked so long as its temperature is higher than 440 degrees.For what values of t is the bar suitable for working? Round your answer to two decimal places.
​

• A) minutes
• B) minutes
• C) minutes
• D) minutes

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