Question

How many significant figures does 400 have?

a. 1
b. 2
c. 3
d. Not enough information

Answer 1

The number 400 has 1 significant figure.

Step-by-step explanation:

To determine the number of significant figures in a number, we follow certain rules:

1. All nonzero digits are significant.
2. Any zeros between significant figures are also significant.
3. Leading zeros (zeros before any nonzero digit) are not significant.
4. Trailing zeros (zeros after the last nonzero digit and following a decimal point) are significant.

Applying these rules to the number 400, we see that it has 1 significant figure since it only contains 1 nonzero digit. Therefore, the answer is a. 1.