Determine the age of the mineral that contains 25% of the parent potassium -40 and 75% of the daughter oregon- 40. The half-life of potassium -40 is 1.25 billion years
I WILL MARK BRAINLEST AND 5 STAR REVIEW. Science its science but it wont let me put it.

If inflation is 6% and nominal gdp grew by 4%, then during the same period real gdp changed by a) -2% b) 2% c) 4% d) 5%

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.

How are students who take the writing portion of accuplacer graded?