exam Maths Puzzle Numerical Ability

Can you please show me how to figure this problem?
Multiply (4xy^3)(2xy^2y)(5xy^2)

Thank you so much!

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exam Other Question

If a skydiver jumps from an airplane at a height of 8256 feet, then for the first 5 seconds, her height above the earth is approximated by the formula: h=-t^2+8256 . How many seconds does it take her to reach 8000 feet? 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?