you can work it out or put in random numbers until the two sides are equal
Answer:
It will take 4 minutes and 30 seconds for hot coffee to cool to a temperature of 25 ° C
Step-by-step explanation:
This problem can be modeled by a first order equation
T(t) = TA + kt
In which TA is the temperature at instant zero and r is the rate of warming(g>0) or cooling(k<0). t is the time in minutes.
The initial temperature of the cup of coffee is 70ºC. So TA = 70. The temperature cools at the rate of 10ºC per minute, so k = -10. So, the equation of the model is:
T(t) = 70 - 10t
We want to know the instant of time when T = 25, so:
25 = 70 - 10t
10t = 70 - 25
10t = 45
t = 4.5 minutes
It will take 4 minutes and 30 seconds for hot coffee to cool to a temperature of 25 ° C
Answer:
The circumference of a circle is not the same as the area of the circle because the circumference represents the distance around the circle while the area represents the amount of space within the circle. Hope this helps.
Answer:
35?
Step-by-step explanation:
sorry I don tget what im supposed to be answering
Associative property of addition is used when you want to group addends.
This is mainly used to cluster set of numbers or in this case, addends. How do
you use the associative property when you break apart addends? Simple you group
them using the open and closed parentheses or brackets. Take for an example 1 +
1 + 2 = 4. Using the associative property you can have either (1 + 1) + 2 = 4
or 1 + (1 + 2) = 4 clustered into place.
