exam Maths Puzzle Numerical Ability

Could you help me with this?

Its on simplifying radical expressions.

sqrt of 81x^5y^9 and it has an index of 4

thank you

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exam Other Question

Working together Linda and Jim can clean the windows of their house in 3 hours and 36 minutes. Linda can clean all the windows by herself in 7 hours. How long will it take Jim to clean the windows by himself? Please help me solve for a,b,c, and d

a+b+c+d=8
a+b+c+2d=7
a+b+2c+3d=3
a+2b+3c+4d=4