Question

Write the following number in scientific notation:
0.000721

Note from userneedshelp12: I do not understand scientific notation at all. So, if you help, will you please explain how you got your answer?

Answer 1

@ghazi

Answer 2

\[7.21 * 10^{-4}\]

Answer 3

count the number of noughts after the decimal point and also the first number > 0

the general form is N.NN... * 10^n
ie N.NN... must be a number >= 1 and <10
and n is the above count
in this case the number is less than 1 so the exponent n is negative

so as ghazi as written

its 7.21 * 10^-4

Answer 4

Thank you both.