Answer:

Step-by-step explanation:
we know that
The circumference of a circle is equal to

we have
<em>Circle X</em>


<em>Circle Y</em>

Find the radius ry
we know that

substitute the value of Cy


Remember that the value of rx is 
substitute

I think the third option is correct.
Answer:
each question was worth 15 points
Step-by-step explanation:
Answer: 5/6
Step-by-step explanation: trust me on this
D) 36x^2-81
both 36x^2 and -81 are perfect squares
difference means subtraction