Write each expression in factored form. If not possible, write "not possible." 1. x² - 144

2. x² + 16

3. 25 - x²

4. 6² - a²

5. 100+ y²

Situation: an archaelogist in turkey discovers a spear head that contains 54% of its original amount of c-14. n = noekt no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years find the age of the spear head to the nearest year