What correctly expresses 0.0000752 in scientific notation?

Answer 1

Scientific notation is when you write too big or too small numbers in an easier-to-understand form by making the number into a product of two numbers, the second factor being ten to a power.

0.0000752 would be expressed as 7.52*(10^-5)

For more information about scientific notation, I suggest you go to this website: http://www.chem.tamu.edu/class/fyp/mathrev/mr-scnot.html