$54
30 divided by 5 is 6. then 6 times 9 is 54
18,000* (21/25)= 15,120.
The population of Lakewood is 15,120.
Hope this would help~
Answer:
<em>The</em><em> </em><em>required</em><em> </em><em>equation</em><em> </em><em>is</em><em> </em><em>5x-y-51</em><em> </em><em>=</em><em> </em><em>0</em>
Step-by-step explanation:

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ΠD = C
πD = 1π
D = 1π/π
D = 1
<span>the length of the diameter is 1 unit</span>