Answer:
t=5.18 minute
Step-by-step explanation:
Using Newton's law of cooling
T is temperature of a cup of coffee at any time t , is the temperature of the surrounding and k is a constant of proportionality in this negative because temperature is decreasing.
To find constant knowing the time and the temperature the first step of the change of energy in cup of coffee
Now using the constant of decreasing can find the time to be a 145 temperature the cup of coffee
Answer: 81 units²
Step-by-step explanation: To solve this problem, remember that the formula for the area of a square is 4s.
Therefore, since the perimeter of the given square is 36, we have 36 = 4s and dividing both sides by 4, 9 = s.
Now, remember that the formula for the area of a square is s² and since the length of a side of the given square is 9, we have (9)² or 81.
So the area of a square that has a perimeter of 36 is 81 units².
Answer:
If ‘A’ can finish a work in ‘n’ days then part of work finished in 1 day
will be .
Step-by-step explanation:
From the question, it is clear that
- If ‘A’ can finish a work in ‘n’ days, then
- we have to determine the part of work finished in 1 day.
So
let '' be the number of days takes to complete the whole work
Let the whole job be denoted as ''
Thus, the part of work finished in 1 day will be:
Therefore, If ‘A’ can finish a work in ‘n’ days then part of work finished in 1 day will be .
Keywords: work, word problem
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Answer:
80.2
Step-by-step explanation:
Answer:
400
Step-by-step explanation:
400