book Maths Puzzle Numerical Ability

I need to write the following in exponential form. What does this mean?
^3 square root of x^2y^3

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book Other Question

Solve:

5 < t - 4 < 6

1 < t < 2

9 < t < 10 find the actual width of the doorway into the kitchen and the dining room if the scale is 2:24 and on the drawing the doorway is 1/4 of an inch.