Question

Which is a valid identifier?
1) $12
2) c.55
3) d.diameter

Answer 1

The valid identifiers are (a) dozen, (b) centimeter, (c) box of pencils, (d) meters per second.

Step-by-step explanation:

a. The number is one, and the unit is dozen.

b. The number is 2.54, and the unit is centimeter.

c. The number 1 is implied because the quantity is only a box. The unit is box of pencils.

d. The number is 88, and the unit is meters per second. Note that in this case the unit is actually a combination of two units: meters and seconds.