America's Everglades<span> once covered almost 11,000 </span>square miles<span> of south Florida. ... half of the </span>1900<span>, the </span>Everglades<span> today is half the </span>size<span> it was a century ago.
This is what I think of it
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5y+4x
5(10) + 4(-5)
50 - 20
30
One example could be, 2 • (9x + 6y)