Question

Which of the following is a quantity that could be represented by the number 2 * 10^(-3)?
A.
the diameter (in meters) of an atom
B.
the time it takes (in minutes) to blink
C.
the occupancy limit of a pizza restaurant
D.
the annual salary of a high school math teacher

Answer 1

thoughts? since the exponent is negative this number is less than 1, which eliminates C (which should be in the tens/hundreds, etc.) and D (which should be in the ten thousands)

so between A+B which one do you think is more reasonable? if you're having trouble deciding, try looking up one of the values (either the atom diameter in meters, or the time it takes to blink) and choose accordingly