exam Maths Puzzle Numerical Ability

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?

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exam Other Question

f(a+b) = f(a)+ f(b) for all positive numbers a and b
a) f(x) = x squared
b) f(x) = x+1
c) f(x) = square root x
d) f(x) = 2/x
e) f(x) = -3x

Thanks,
Casey 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