5x + 9x + 26 = 180
14x = 180 - 26
14x = 154
x = 154 / 14
x = 11
answer
B. 11
Well, I'll answer this problem:
<span>mercury-197 has a half life of about 64 hours. After 288 hours about how many miligrams of a 750mg sample
According to this site:
http://www.1728.org/halflife.htm
Ending Amount = Beginning amount / 2^n
where "n" is the number of half-lives (elapsed time / half-life)
</span>"n" =288 / 64 = 4.5
<span>Ending Amount = 750 mg / 2^4.5
</span>Ending Amount = 750 mg / <span><span>22.627416998
</span>
</span>Ending Amount = <span><span><span>33.146 mg
Answer is 33 milligrams
</span></span></span>
5 because 4x5 = 20 and also 3x6= 18 but add another because 18 dont fill the pounds of plaster
