Answer:
3
Step-by-step explanation:
there are 3 more markers than pencils
Degree days are the difference between the daily temperature mean, (high temperature plus low temperature divided by two) and 65°F. 65°F because we assume that at this temperature we do not need cooling or heating.
In our case the daily mean temperature is 83°F and X is the number of cooling-degree days.
X=83-65
X=18
Answer:
The centre's coordinates are: (5; -1)
Radius is the square of 9:

Answer: Radius=3; the cente's coordinates are(5; -1)
Good luck!
Intelligent Muslim,
From Uzbekistan.