Answer:

Step-by-step explanation:
Subtract the 4 from 9
a/b=c
you gonna cross multiple.
so, b multiple by c=a
bc=a
then you divide it by c
so the answer will be b=a/c
Answer:
18pi units is the circumference
81pi units² is the area
Step-by-step explanation:
Radius² = (-2-7)² + (2-2)² = 9²
Radius = 9
Circumference = 2pi×r
= 18pi
Area = pi × r²
= 81pi
<em>Absolute value represents distance from zero on a number line.</em>
<em>-7 and 7 are the same distance away from zero, 7 units.</em>
<em>To visualize this, take a look at the image I have made below.</em>