book Maths Puzzle Numerical Ability

find the vertices of the hyperbola with the equation
{{{(x-3)^2/25-(y+4)^2/4=1}}}

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I have this problem with an answer, but i can't figure out the equation to get the answer, or the mathematical way to find the answer (I use guess and check). If you c It is estimated that the Earth is losing 4000 species of plants and animals per year. If S represents the number of species living last year year, how many species are on Earth this year..