Final answer:
The numbers in scientific notation should be converted to decimal form to compare them. The numbers in order from least to greatest are 4.5, 9.7, and 16.7.
Step-by-step explanation:
The numbers 1.67, 9.7, and 4.5 are written in scientific notation. In scientific notation, numbers are written in the form of a decimal number between 1 and 10, multiplied by a power of 10. To compare these numbers from least to greatest, we need to convert them to their decimal form.
Converting 1.67 to decimal form gives us 1.67 x 10^1 = 16.7.
Converting 9.7 to decimal form gives us 9.7 x 10^0 = 9.7.
Converting 4.5 to decimal form gives us 4.5 x 10^0 = 4.5.
Therefore, the numbers in order from least to greatest are 4.5, 9.7, and 16.7. The correct answer is option B. 4.5, 9.7, 1.67.