Answer:
multiply by 10 on both sides
that is to get rid of the denominator
Sorry im a little late but here's how i did it.
Hope this helps! :)
Answer:
Part 1) The area of the circle is 
Part 2) The circumference of the circle is 
Step-by-step explanation:
step 1
The area of a circle is equal to

we have
---> the radius is half the diameter

substitute


step 2
The circumference of a circle is equal to

we have

substitute


Answer:
the second one
Step-by-step explanation:
Isolate the x. Root both sides
√x²< √81
x < 9 is your answer
hope this helps