Posted by **Gabby** on Wednesday, February 5, 2014 at 1:06pm.

Plz help me with the following problems.

Simplify. 5^-1(3^-2)

Simplify. mn^-4/p^0q^-2

Write a scientific notation. 0.0042

Write in standard notation. 6.12*10^3

Simplify. Write in scientific notation. 0.5(8 * 10^5)

Simplify. Write in scientific notation. (9 * 10^-3)^2

Evaluate 1/2a^-4b^2 for a=-2 and b=4.

Simplify (4xy^2)^3(xy)^5

Simplify (2t^-3)^3(0.4r)^2

- Algebra 1 -
**Gabby**, Wednesday, February 5, 2014 at 1:26pm
Actually I only need help with the second problem,and the 7th problem,

Simplify. mn^-4/p^0q^-2

Evaluate 1/2a^-4b^2 for a=-2 and b=4.

- Algebra 1 -
**Steve**, Wednesday, February 5, 2014 at 1:34pm
p^0 = 1, so

mn^-4/p^0q^-2 = (m/n^4) / (1/q^2) = mq^2/n^4

1/(2 (-2)^-4 (4)^2)

1/(2 (1/16) (16))

1/2

Note that (-2)^4 = (-2)(-2)(-2)(-2) = +16

- Algebra 1 -
**Gabby**, Wednesday, February 5, 2014 at 1:36pm
Thank you Steve~!

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