The temperature at 12 noon was 10℃ above zero. if it decreases at the rate of 2℃ per hour until midnight, at what time would the temperature be 8℃ below zero?
Answers
Answered by
1
11:00 PM is the answer
it was so easy
it was so easy
Siddharthakumarpanda:
your answer is not justified
Then you try to justify it
as after 9 hours the temperature will be (-8) degree celcius and 9 hours after 12 noon is 9 pm
and 9 pm is not equal to eleven pm, there is a huge difference of 2 hours
Answered by
3
we have temperature = 10°C
Now,
rate of decreasing in the temperature = 2°C
Let,
the time required to reach the temperature = x hours
So,
-8 = 10 - 2x
=> (-8) - 10 = 2x
=> (-18) = 2x
=> x = 9 hours
therefore at 9 pm, the temperature will be 8°C below zero.
NOTE THAT :- THERE IS A NEGATIVE SIGN IN THE (-18) = 2x, AS THE TEMPERATURE IS LOWERED WITH AN INCREASE IN TIME.
Now,
rate of decreasing in the temperature = 2°C
Let,
the time required to reach the temperature = x hours
So,
-8 = 10 - 2x
=> (-8) - 10 = 2x
=> (-18) = 2x
=> x = 9 hours
therefore at 9 pm, the temperature will be 8°C below zero.
NOTE THAT :- THERE IS A NEGATIVE SIGN IN THE (-18) = 2x, AS THE TEMPERATURE IS LOWERED WITH AN INCREASE IN TIME.
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