The table shows the diameters of three planets:

Planet Diameter (kilometers)

Neptune 4.9 ⋅ 104

Saturn 1.2 ⋅ 105

Uranus 5.1 ⋅ 104

Order the planets from greatest to least diameter.

We will compare the powers of 10 (assuming ya meant 10⁴ when yo wrote 104)

so

we can actually just expand them

neptune=49000

saturn=120000

uranus=51000

so order from largest is saturn, uranus then neptune