if a sphere has a volume of 0.0057 m what is its volume in ml?

The unit of volume should be "m³" instead of "m".

1 m³ = 1000 ℓ
1 L = 1000 mℓ

0.0057 m³
= (0.0057 m³) × (1000 ℓ / 1 m³) × (1000 mℓ / 1 ℓ)
= 5700 mℓ

this picture should help 

m = 100 cm
0.0057 m^3 = 5700 cm^3 = 5700 ml