The temperature of the room is 10°C above zero. It descends at the rate of 2°C per hour, in how many hours the temperature be 8°C below zero?

9hours

Step-by-step explanation:

The total temperature would be decreased by 18°C.

18/2 =9

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363