Answer:
Difference indicates subtraction: The difference of a number and 9 is (x−9) Twice the difference means 2(x−9) We know that the answer to this is 2 , so as an equation: 2(x−9)=2.
Step-by-step explanation:
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Answer:
i can't understand the question but if you put a link I can figure it out
Answer:

Step-by-step explanation:
The amplitude (A) and the mean (M) temperature are given by:

The mean temperature, 45 degrees. occurs at midnight (t=0) and the frequency is f=24h. Therefore, the temperature D, in degrees, as a function of t, in hours, is:
