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A hot metal bar is submerged in a large reservoir of water whose temperature is 60 degrees F. The temperature of the bar 20s after submersion is 100 degrees F. After 1 minute, the temp has cooled to 80 degrees F.

a. Determine the cooling constant k.
c. what is the formula for F(t)?
d. Determine the temperature of the bar at the moment it is submerged.

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