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45 ppl / km²   *  33 km²  = 1485 ppl

If we know that there are 45 people per square kilometer and there are 33 square kilometers we can make this equation:

45 * 33 = y

(the * is another way write multiplication) 
 

All we have to do is multiply the numbers!

45 x 33 = 1,485

I hope this helps! :D