Algebra 1
posted by Gabby .
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

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. 
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 
Thank you Steve~!

1. B. 1/45
2. A. mq^2/n^4
3. C. 4.2 x 10^3
4. A. 6,120
5. D. 4 x 10^5
6. A. 8.1 x 10^5
7. B. 1/2
8. C. Sometimes
9. A. 64x^8y^11
10. C. 1.28r^2/t^9
Heheh :)))) 
Cuz I'm Cool Is 100% right

Thanks!