I have 10 question like this, anybody can show me this one how to do it.
Simplify the following and give answers in scientific notation:
0.00320 x 450,000 / 90,000
surely your text has a discussion of scientific notation and the methods of its use.
If not, a google search will provide copious information. Any explanation here would be less detailed, to be sure.
For this problem, you have
3.2*10^-3 * 4.5*10^5 / 9.0*10^4
= 3.2*4.5/9.0 * 10^(-3+5-4)
= 1.6 * 10^-2
= 0.016
if you check on your calculator, you will see that this is so.