If 2a+3b=12 and 3b-4=2, then what is the value of a?

Does anyone have some ideas for an herbalism or culinary project? i need to start my graduation project so i'm prepping for it

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Which statements are true for invasive species? 1. they always stabilize an ecosystem. 2. they’re always successful in adjusting to a new habitat. 3. they often compete with the native species for resources. 4. they have the ability to displace the native species. 5. they’re always pests.