Convert the given lengths to millimeters: 135 cm 7 mm, 127 cm 5 mm, 60 cm, and 33 cm.

$$1350 \text{ mm} + 7 \text{ mm} = 1357 \text{ mm}$$

Rakus's height is $\boxed{\text{1357 mm}}$.

Question 5:
The length of the ribbon is $127 \text{ cm } 5 \text{ mm}$.

$$1270 \text{ mm} + 5 \text{ mm} = 1275 \text{ mm}$$

The length of the ribbon is $\boxed{\text{1275 mm}}$.

Question 7:
A television screen has a length of $60 \text{ cm}$ and a width of $33 \text{ cm}$.

a) What is the length of the television screen in millimeters?

$$60 \text{ cm} = 60 \times 10 \text{ mm} = 600 \text{ mm}$$

The length of the television screen is $\boxed{\text{600 mm}}$.

b) What is the width of the television screen in millimeters?

$$33 \text{ cm} = 33 \times 10 \text{ mm} = 330 \text{ mm}$$

The width of the television screen is $\boxed{\text{330 mm}}$.

Question 8:
The question asks: "A tablet is 27cm long what is the length of 60cm and what tablet in millimetres?" I will interpret this as two separate conversions: the tablet's length and the length of 60cm, both to millimeters.

a) What is the length of the tablet ($27 \text{ cm}$) in millimeters?

$$27 \text{ cm} = 27 \times 10 \text{ mm} = 270 \text{ mm}$$

The length of the tablet is $\boxed{\text{270 mm}}$.

b) What is the length of $60 \text{ cm}$ in millimeters?

$$60 \text{ cm} = 60 \times 10 \text{ mm} = 600 \text{ mm}$$

The length of $60 \text{ cm}$ is $\boxed{\text{600 mm}}$.