Calculate the area and cost of carpeting a square room, the area of a square farmyard, and the volume of a cube-shaped box.

The length of the room is $5 \text{ m}$.
The formula for the area of a square is $\text{Area} = \text{length}^2$.

The cost is $\text{R}70$ per $\text{m}^2$.

Mrs Lehola needs to buy $\boxed{25 \text{ m}^2}$ of carpeting, and it will cost $\boxed{\text{R}1750}$.

1. b) Mrs Lehola's farmyard:

The farmyard is $600 \text{ m}$ long and $600 \text{ m}$ wide.
The formula for the area of a rectangle (or square) is $\text{Area} = \text{length} \times \text{width}$.

The area of her farm is $\boxed{360000 \text{ m}^2}$.

2. a) Volume of the box of biscuits:

The box has a length of $10 \text{ cm}$, a breadth of $10 \text{ cm}$, and a height of $10 \text{ cm}$.
The formula for the volume of a rectangular prism is $\text{Volume} = \text{length} \times \text{breadth} \times \text{height}$.

The volume of the box is $\boxed{1000 \text{ cm}^3}$.

2. b) Volume of Mr Radebe's bathroom:

A cubic bathroom has equal length, breadth, and height. The height is given as $3 \text{ m}$, so the length and breadth are also $3 \text{ m}$.

The formula for the volume of a cube is $\text{Volume} = \text{side}^3$.

The volume of his bathroom is $\boxed{27 \text{ m}^3}$.

2. c) Length of the side of the toy dice:

The volume of the dice is $216 \text{ cm}^3$. Since it's a cube, its volume is $\text{side}^3$.
We need to find the side length, so we take the cube root of the volume.

The length of the side of the dice is $\boxed{6 \text{ cm}}$.