exam Maths Puzzle Numerical Ability

8.) The length of a rectangle is fixed at 29 cm. What widths will make the perimeter greater than 92 cm?

The width must be greater than ______ cm

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Hello. Can you please help me with these? This comes from my college algebra class. My problem is how to rationalize the denominator:

1. x/sqrt[x-1]-sqrt[x]
2. ((2/sqrt[2-x]) Marsha has money in two savings accounts. One rate is 8% and the other is 10%. If she has $200 more in the 10% account, how much is invested at 8% if the total interest is $101?

Need a little help with this problem, Thank you!