Maths;Check Answers Please :P
posted by Electro on .
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

can anyone help?

15 , 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 
1. b
2. a
3. c
4. a
5. d
6. a
7. b
8. c
9. a
10. c 
@! is correct 100% on the more multiplication proerties and exponents Quiz for Algebra 1B on Connections Academy! Good luck everyonee