Question

the temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would be the temperature be 8°C below zero? What would be the temperature at midnight.


Guys please answer in full statement and give me a short and simple answer. The one with the best answer will be marked as the brainlist​

Answer 1

Correct option is

B

−14

o

C

At 12 noon, the temperature =10°C above zero

The temperature is decreasing at 2°C per hour

8°C below zero =−8°C

So, total fall in temperature from 10°C to 0°C and from 0°C to −8°C=18°C

Since the temperature falls 2°C in every one hour.

Therefore, to decrease 18°C, time taken = 18/2

= 9 hours

Present time is 12 noon so, the time when the temperature is −8°C

=12noon+9hours

So, The time at which the temperature will be −8°C=9PM

At 9 PM, the temperature is −8°C, the temperature at 12 midnight will be =

(−8°C)+(−2°C×3hours)

=(−8°C)+(−6°C)

=−14°C

So, at 12 midnight the temperature will be−14°C.

Answer 2

Answer:

The temperature at 12 noon was 10°C

and the temperature decreases at the rate of 2°C per hour until midnight

so, for every hour the temperature is decreasing by 2°C

So, at 1 pm, the temperature would be 10°C - 2°C = 8°C

At 2 pm, the temperature would be 8°C - 2°C = 6°C

At 3 pm, the temperature would be 6°C - 2°C = 4°C

At 4 pm, the temperature would be 4°C - 2°C = 2°C

At 5 pm, the temperature would be 2°C - 2°C = 0°C

At 6 pm, the temperature would be 0°C - 2°C = -2°C

At 7 pm, the temperature would be -2°C - 2°C = -4°C

At 8 pm, the temperature would be -4°C - 2°C = -6°C

At 9 pm, the temperature would be -6°C - 2°C = -8°C

At 10 pm, the temperature would be -8°C - 2°C = -10°C

At 11 pm, the temperature would be -10°C - 2°C = -12°C

At 12 midnight, the temperature would be -12°C - 2°C = -14°C

Hence the temperature would be 8°C below zero at 9 pm, and

the temperature at midnight will be 14°C below zero.

Step-by-step explanation: