A pan is heated to 377°F, then removed from the heat and allowed to cool in a kitchen where the room temperature is a constant 7
6°F. The formula below can be used to find D, the difference in temperature between the pan and the room after t minutes.
D = 301e-0.05t
What is the approximate temperature of the pan after it has been away from the heat for 8 minutes?
A.
277.8°F
B.
201.8°F
C.
125.8°F
D.
525°F
D = 301e-0.05t
What is the approximate temperature of the pan after it has been away from the heat for 8 minutes?
A.
277.8°F
B.
201.8°F
C.
125.8°F
D.
525°F
1 answer:
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Answer:
A.) x-y=2 and x+2y=-2
Step-by-step explanation:
For option A, we have:
x-y=2
x+2y=-2
Subtract the first equation from the second, to get:
2y--y=-2-2
This implies that:
2y+y=-2-2
Simplify to get:
3y=-4
Divide both sides by 3 to get:
We substitute y=-1.3 into the first equation to get:
x--1.3=2
x+1.3=2
x=2-1.3
x=0.7
The solution is (0.7,-1.3), which is approximately (0.7, -1.4)
By inspection, all the other factors have solutions not close to (0.7, -1.4)