Calculate these roots: a) [3]1000 - [3]125, b) [3]64, c) sqrt(25 - 16), d) sqrt(100 - 64). Compare these calculations. Replace with >, < or =. a) 23 32

$\sqrt[3]{1000} = 10$  
$\sqrt[3]{125} = 5$

$10 - 5 = 5$  
The answer is $\boxed{5}$.

$4 \times 4 \times 4 = 64$  
The answer is $\boxed{4}$.

$25 - 16 = 9$

$\sqrt{9} = 3$  
The answer is $\boxed{3}$.

$100 - 64 = 36$

$\sqrt{36} = 6$  
The answer is $\boxed{6}$.

$2^3 = 2 \times 2 \times 2 = 8$

$3^2 = 3 \times 3 = 9$

$8 < 9$  
The comparison is $\boxed{2^3 < 3^2}$.

$2 \times 4 = 8$

$2^4 = 2 \times 2 \times 2 \times 2 = 16$

$8 < 16$  
The comparison is $\boxed{2 \times 4 < 2^4}$.

$8 \times 8 = 64$

$8^2 = 8 \times 8 = 64$

$64 = 64$  
The comparison is $\boxed{8 \times 8 = 8^2}$.

$9^2 = 9 \times 9 = 81$

$9 \times 2 = 18$

$81 > 18$  
The comparison is $\boxed{9^2 > 9 \times 2}$.

$7^2 = 7 \times 7 = 49$

$7^3 = 7 \times 7 \times 7 = 343$

$49 < 343$  
The comparison is $\boxed{7^2 < 7^3}$.

$\sqrt[3]{8} = 2$

$\sqrt[3]{27} = 3$

$2 < 3$  
The comparison is $\boxed{\sqrt[3]{8} < \sqrt[3]{27}}$.

$6^3 = 6 \times 6 \times 6 = 216$

$5^4 = 5 \times 5 \times 5 \times 5 = 625$

$216 < 625$  
The comparison is $\boxed{6^3 < 5^4}$.

$\text{Area} = \text{length} \times \text{breadth}$

$\text{Area} = 4 \text{ m} \times 3 \text{ m}$

$\text{Area} = 12 \text{ m}^2$  
Mr Tladi needs $\boxed{12 \text{ m}^2}$ of bricks.

$\text{Volume} = \text{length} \times \text{breadth} \times \text{height}$

$\text{Volume} = 3  m \times 2