All need to have positive exponents only! simplify all and show work pls :) 1. (5/2)^3

2. 2^-4

3. (5h^-3)^2(3h^-7)

4. a^5b^7/a^4c^3
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Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

If rt is greater than ba, which statement must be true ?

How many ordered pairs of positive integers satisfy xy=32?