Answer:
Rn-222
Step-by-step explanation:
this decay takes specified step therefore Rn-222is not a decaying process
Answer:
178 pages
Step-by-step explanation:
convert feet to inches
9 x 12 = 108
11 x 12 = 132
108 x 132 = 14256
8 x 10 = 80
14256/80 = 178 with a little left over