Question 99117
Let's say we had 10,000 species last year. If we lose 4,000 every year then this year we would have



10,000-4,000=6,000



So we would have 6,000 species. So to find out how many species we have leftover, simply subtract the change in species (which is 4000) from the starting amount



Since we start with S, we can use the same technique to find out how many species we have left. Simply subtract 4,000 from S to get



{{{S-4000}}}



So we'll have {{{S-4000}}} species this year