Answer: [tex]84\ \text{units}[/tex]
Step-by-step explanation:
Given
The length of each cube is [tex]a=14\ \text{units}[/tex]
If there are 6 cubes placed over each other, then the height achieved by the cubes is
[tex]\Rightarrow 6\times 14\\\Rightarrow 84\ \text{units}[/tex]