grace thought of a number, added 7, multiplied by 3, took away 5 and divided by 4 to give an answer of 7. what was her starting number?

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.