Hard Math :(
posted by Dude .
2. What answer represents this number in scientific notation?
0.00000916
a. 916 x 10^8
b. 9.16 x 10^6
c. 916 x 10^8
d. 9.16 x 10^6
3. What is this number in standard form?
6.8 x 10^4
a. 5,750,000,000
b. 575,000,000,000
c. 0.00000000575
d. 0.575000000000
5. What is this number in standard form?
5.2 x 10^8
a. 0.000000052
b. 0.0000000052
c. 520,000,000
5,200,000,000
plz help me

in scientific notation, the leading value n is always 1.0 <= n < 10.0
2b
3? no relation between 6.8 and choices
5c 
then wat is 3

no idea. Reread the problems. I figure you have mixed up #3 and #4, since the numbers are totally different.
to get your own answer, just move the decimal place 4 spots to the right:
6.8x10^0 = 6.8
6.8x10^1 = 0.68
6.8x10^2 = 0.068
. . . 
The answer for 3 is 0.00068. That isn't one of the choices so there is a typo or someone goofed when they wrote the problem.