Answer:
Rn-222
Step-by-step explanation:
this decay takes specified step therefore Rn-222is not a decaying process
Answer:2/5
Step-by-step explanation:8 out of 20 marbles reduces down to 2/5.
<em>(x - 7)(x - 5)</em>
- <em>Step-by-step explanation:</em>
<em>x² - 12x + 35 =</em>
<em>= x² - 5x - 7x + 35</em>
<em>= x(x - 5) - 7(x - 5)</em>
<em>= (x - 7)(x - 5)</em>