Posted by **Electro** on Friday, January 17, 2014 at 6:37pm.

1. Simplify. 5^–1(3^–2)

My answer: 1/45

3. Write in scientific notation. 0.0042

My answer: 4.2 X 10^-3

4. Write in standard notation. 6.12 × 10^3

my answer: 6,120

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

My answer: 4 x 10^5

6. Simplify. Write in scientific notation. (9 × 10^–3)^2

my answer is: 8.1 x 10^5

8. Is the following statement always, never, or sometimes true?

A number raised to a negative exponent is negative.

My answer is: sometimes

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

Idk this one

10. Simplify (2t^–3)^3(0.4r)^2

idk this one

- Maths;Check Answers Please :P -
**Electro**, Friday, January 17, 2014 at 6:49pm
can anyone help?

- Maths;Check Answers Please :P -
**Reiny**, Saturday, January 18, 2014 at 12:02am
1-5 , all good

#6.

(9 × 10^–3)^2

= (9 × 10^–3)(9 × 10^–3)

= 81 x 10^-6

= 8.1 x 10^-5

#8 , ok

#9

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

= (64x^3 y^6)(x^5 y^5)

= 64 x^8 y^11

10.

(2t^-3)^3 (.4r)^2

= 8 t^-9 (.16r^2

= 12.8 r^2 / t^9

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