Question

How many places to the left should the decimal point be moved to write 7.2 × 10-9 in standard form?

Answer 1

Answer: To write a large number in scientific notation, move the decimal point to the left to obtain a number between 1 and 10. Since moving the decimal point changes the value, you have to multiply the decimal by a power of 10 so that the expression has the same value.

Step-by-step explanation:

Answer 2

9 places should be moved towards left
here eight zeros after decimal point
7.2 × 10-9 = 0. 0000000072