Question

icp wednesday quiz 9/17/25
how many kilometers are in 4,500 mm?
a. 0.45 km
b. 4.5 x 10^6 km
c. 0.0045 km
d. 4.5 x 10^-6 km

Explanation:

Step1: Recall conversion factors

We know that 1 km = 1000 m, 1 m = 1000 mm. So 1 km=1000×1000 mm = 10^6 mm.

Step2: Set up conversion

To convert 4500 mm to km, we use the ratio $\frac{4500\ mm}{1}\times\frac{1\ km}{10^{6}\ mm}$.

Step3: Calculate result

$4500\times\frac{1}{10^{6}}=\frac{4500}{10^{6}} = 4.5\times10^{- 3}\times10^{-3}=4.5\times10^{-6}$ km.

Answer:

D. $4.5\times 10^{-6}$ km