x² + 3x = x + 6 + x²
<u>-x² </u> <u> -x² </u>
3x = x + 6
<u> -x </u> <u>-x </u>
2x = 6
=
x = 3
Answer: x = 3
Write a decimal in tenths that is less than 3.81 but greater than 3.0
2 answers:
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Given:
From 1:00 pm to 3:30 pm the room temperature had dropped from 82F to 72F.
To find:
The average rate of change of temperature in this room over the period.
Solution:
Time between 1:00 pm to 3:30 pm is 2 hr 30 minutes, i.e., 2.5 hours.
So, change in time is 2.5 hours.
Room temperature had dropped from 82F to 72F.
Change in temperature = 72 F - 82 F
= -10 F
We know that, average rate of change of temperature in this room over the period is
Therefore, the average rate of change of temperature in this room over the period is -4. It means the temperature is decreasing 4 F per hour.