exam Maths Puzzle Numerical Ability

I Need to collect the like terms of the following equation.
(6mn-m^2+10mn-5m^2)
But the answer I have doesnt look right, can you help me please?

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exam Other Question

Science and medicine. It is estimated that the Earth is losing 4000 species of
plants and animals every year. If S represents the number of species living last year, how many species are on Earth this year? Zachary, Olivia, Destiny, Caleb, Christopher, Julia, and Brianna are 31,37,33,24,34,21, and 19 years old. Find each persons age.