8th grade Math

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!

asked by Mika
  1. i need help with this home work i need to write an algebraic expression for each word. 1.5 less than the prouduct of 3 and p

    posted by jasmine
  2. 3p - 1.5

    posted by Charlie
  3. how do you convert .833333333333....... into a fraction

    posted by jessica
  4. what is more dense 14cm3 or 8cm3

    posted by bob
  5. five times the sum of a number and 2 is 25 find the number

    posted by Anonymous
  6. how many tiles 15 cm square will be needed to cover a floor 5.8 m by 6.90m?

    posted by Anonymous
  7. To anonymous 5(x+2) = 35 is the equation. Pretty easy to solve from there

    posted by Dustin
  8. thank u very much

    posted by rovika grg
  9. Holy cow this question has a lot of answers!

    posted by HomoNovus
  10. Make .833333333333 as a fraction

    posted by Mrs. Smith
  11. Estimate the square root of 72 how to find it

    posted by Ravi
  12. To Jessica and Mrs Smith
    5/6=.833333333
    100x=83.333333333-
    10x= 8.333333333
    --------------------------------
    90x=75
    x=75/90=5/6.

    posted by Tissy
  13. in scientific notation.
    (2.74×10^7)+(5.6×10^7=

    posted by Gina-helen
  14. 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.

    posted by sanchit sahu
  15. 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.

    posted by sanchit sahu

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