the first one is correct
the second one is not right because you can only have a digit in the ones section
so it should be 2.1 x 10^9
Putting in scientific notation (3000)(20000)
6*10^7
Solving
(3*10^5)(7*10^3)
21*10^9
Is this right, please help
2 answers
first one is right,
second one should have been 2.1 * 10^9
perhaps it was just a typo.
second one should have been 2.1 * 10^9
perhaps it was just a typo.