7th grade math standard form scientific notation
posted by Delilah .
In standard form:
5. 3.2 x 10^3
7. 4.1 x 10^8
9. Write the average weight of a blue whale, 2.6 x 10^5, in standard form.
15. 2.5 x 10^3
17. 1.05 x 10^2
19. Write the size of a grain of very fine sand, about 9.35 x 10^3 cm, in standard form.
Can somebody help? I have been stuck on these questions for 30 minutes....
Thanks.

I don't understand what you mean by "I have been stuck on these questions for 30 minutes.... "
Are you just staring at the questions?
The concept of scientific notation can be learned in less than 5 minutes.
5. 3.2 x 10^3
= 5.3 x 1000
= 5300
15 . 2.5 x 10^3
= 2.5 x .001
= 0.0025
You try the others. 
what operation is being performed 1.2x10^2+2.5x10^4=

5.7 * 10^6