exam Maths Puzzle Numerical Ability

ADDING AND SUBTRACTING RADIACALS
How to:
3((Square Root)27 + 3)
2 (square root) 12 - 7 (square root)3
(square root)8 + 2 (square toot2
-3 (square root)6 + 8 (square root)6

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exam Other Question

find the GCF of the product. (3b+6)(2b-10)

i think it is 6. 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?