just wanted to check my answers for a quick check since im not really confident in scientific notations...

Question

1)
The area of Greenland is 840,000 square miles. What is this number in scientific notation?

A) 840x10^5
B) 84x10^-5
C) 8.4x10^5 ***
D)8.4x10^-5

2)
What answer represents 0.00000916 in scientific notation?

A) 916x10^-8
B) 9.16x10^-6 ***
C) 916x10^8
D) 9.16x10^6

3)
What is 5.75x10^9 in standard form?

A) 5,750,000,000 ****
B) 575,000,000,000
C) 0.00000000575
D)0.575000000000

4)
What is 6.8x1-^-4 in standard form

A) 68,000
B) 680,000
C)0.000068
D) 0.00068 ***

5)
In a recent year the world reproduction of wheat was about 5.2x10^8 metric tons. What is this number in scientific notation?

A) 0.000000052
B)0.0000000052
C)520,000,000 ***
D)5,200,000,000

Answer 1

Agree on first 4, but in 5, the value is already in scientific notation, but the standard form is correct.

Answer 2

1. C
2. B
3. A
4. D
5.C

Answer 3

raya is right