The answer would be "to help you decipher symbols and scale."
Without the key, a lot of the symbols would be quite confusing and you wouldn't know if it was 5 miles or 500 miles. Everything else is implied throughout the map, but the key's purpose is definitely to help you decipher symbols and scale.
Answer:
girl they shouldn't bc it's not their life
1. Touchscreen
2. Interactive
3. Wii
4. VR headset
5. Joystick
6. VR glove
This should be the right order, hope it helps! :)
I don't know the context, but I believe the answer must be predicate adjective. If your sentence goes something like "This song is popular", popular is a predicate adjective because it goes together with a linking verb ("is"), and modifies the subject ("song"), telling us what the subject is, and not what it does.