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1 answer:
Answer:
-10
Step-by-step explanation:
So it skipped labeling a marker as a number between 10 and 2. The difference between 10 and 2 is 10-2=8.
Half of 8 is 4. So it is going down by 4 each time.
So start at the marker called 10.
The next marker would be 10-4=6.
The next labeled marked is 2 which would do get 2 from doing 6-4=2.
The next one below 2 would be 2-4=-2.
The next one below that one would be -2-4=-6.
The ? would be -6-4=-10.
I also provided a drawing.
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Answer:
76.25°
Step-by-step explanation:
The solution to the differential equation is an exponential curve with a horizontal asymptote at Tm. It passes through (0, 145) and (30, 95), so the equation can be written as ...
T = 80 +65((95-65)/(145-65))^(t/30)
T = 80 +65(3/8)^(t/30)
That is, the temperature difference is reduced to 3/8 of its original value in 30 minutes.
Since the coffee in cup B cools twice as fast, it will cool to the same temperature (95°) in 15 minutes. In the next 15 minutes, the temperature difference will be reduced to (3/8)^2 of the original 80°, so will be 11.25°. That is, the temperature of cup B will be ...
11.25° +65° = 76.25°
after 30 minutes.
