Calculate the average atomic mass for the element beryllium, given this information about the relative abundance of its 3 isotopes.
Be-8 = 0.2% Be-9 = 98.9% Be-10 = 0.9%. Please show all your work.

Less Credit so, I won't able

 9.007

Explanation:

Be-8  8 x   0.20%  =0.016

Be-99 x98.90%=     8.901

Be-1010 x0.90%  =        0.09

        100.00%       9.007

Because the question is based in the context of the events of Pearl Harbor, I will answer in terms of what is predicted for the United States navy at that time. Tojo predicted that the United States navy would become stronger during the few years after the attack on Pearl Harbor. Because Japan's oil supply was running low and they new that the United States' navy would increase in both size and capability, it was not wise to continue.