Calculate the volume of right rectangular prisms given their dimensions in cubes and convert to milliliters.

Length = 3 cubes  
Width = 2 cubes  
Height = 2 cubes

Total cubes = 3 × 2 × 2 = 12 cubes  
A container shaped like this right rectangular prism can hold exactly **12** mL of water.

Since 1 cubic centimeter = 1 mL, 12 cubic centimeters = 12 mL.

Length = 5 cubes  
Width = 2 cubes  
Height = 3 cubes

Total cubes = 5 × 2 × 3 = 30 cubes  
A container shaped like this right rectangular prism can hold exactly **30** mL of water.

Since 1 cubic centimeter = 1 mL, 30 cubic centimeters = 30 mL.

Length = 5 cm  
Width = 3 cm  
Height = 10 cm

Volume = 5 cm × 3 cm × 10 cm  
Volume = 15 cm² × 10 cm  
Volume = 150 cm³  
**Riley's flower vase can hold **150** milliliters of water.**

Since 1 cm³ = 1 mL, 150 cm³ = 150 mL.