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 the temperature be 8°C below zero? What would be the temperature at mid-night?

The answer to your question is a) 21:00   b) -14°C

Step-by-step explanation:

Data

Temperature at noon = 10°C

rate = 2°C/hour

a) Do a chart to solve this problem

            Time          Temperature

            12:00                10°C

             13:00                 8°C

             14:00                 6°C

             15:00                 4°C

             16:00                 2°C

             17:00                  0°C

              18:00                -2°C

             19:00                -4°C

             20:00               -6°C

             21:00                -8°C

b)

            22:00                -10°C

             23:00               -12°C

            24:00                -14°C

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.