Answer:

after 6 hours

Step-by-step explanation:

in form of AP

a = 9 , d = -3 , An= - 6

An = a + (n-1) * d

-6 = 9 +(n-1)*(-3)

(n-1) * (-3) = -6-9

n-1 = -15/(-3)

n = 5 + 1

n = 6

therefore after 6 hours , it will be -6 degree celcius

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after 5 hour

Step-by-step explanation:

12AM - ( 9° )C

1AM - ( 6° )C

2AM - ( 3° )C

3AM - ( 0° )C

4AM - ( -3° )C

5AM - ( -6° )C

SO distance of time is 5 hour

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