Question

janiya is taking a road trip. the distance she plans to travel can be written as 3×10² kilometers, 3×10⁵ meters, 3×10⁷ centimeters, or 3×10⁸ millimeters. which distance uses the most appropriate units? (1 point)
o 3×10² kilometers
o 3×10⁷ centimeters
o 3×10⁵ meters
o 3×10⁸ millimeters

Explanation:

Step1: Recall unit - size concept

Larger distances are better represented by larger - scale units. Kilometers are larger than meters, centimeters, and millimeters.

Step2: Analyze the values

We want a unit that gives a non - overly large or small number for a road trip distance. $3\times10^{2}$ kilometers is 300 kilometers, a reasonable number for a road trip distance. $3\times10^{5}$ meters is 300000 meters or 300 kilometers, but meters are a smaller unit and the number is larger. $3\times10^{7}$ centimeters is 30000000 centimeters or 300 kilometers, but centimeters are even smaller and the number is much larger. $3\times10^{8}$ millimeters is 300000000 millimeters or 300 kilometers, but millimeters are the smallest of these units and the number is the largest.

Answer:

$3\times 10^{2}$ kilometers