8th grade Math

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I'm actually in 7th grade, but I'm doing 8th grade pre-algebra, but anyway, here:
I'm supposed to simplify these four problems and I don't really understand how:

28s (15 power)
____
42s (12 power)



4m+(n[7th power]m)


63m(5 power)n(6 power)
______________________
27mn


3a·4a(4 power)
______________
28a(2 power)



Thanks!

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    3p - 1.5

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    how do you convert .833333333333....... into a fraction

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    thank u very much

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    Holy cow this question has a lot of answers!

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    To Jessica and Mrs Smith
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    10x= 8.333333333
    --------------------------------
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    in scientific notation.
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    The area of trapezium is 180cm and its hight is 9cm. If one of the parallel side ia langer then the other by 6cm, find the two parallel side.

  • math -

    The area of trapezium is 180cm and its hight is 9cm. If one of the parallel side ia langer then the other by 6cm, find the two parallel side.

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