Answer:
For scientific notation, we write one number to the left of the decimal point and the other numbers are written as a power of ten.
2.)1,220,000,000
[tex]1.22\times10^{9}[/tex]
3.)0.0287
We can write this in fraction form as:
[tex]\frac{287}{10000}[/tex]
So, when 10000 will go up that is in numerator it will hold a negative power.
So, in scientific notation it will be [tex]2.87\times10^{-2}[/tex]