<span> half life i= 78 hours
amount after 78 hours is 395 kg:
395 = 790e^(k*78)
Dividing by 790 and taking natural log
ln (395/790) = (k*78)
-0.6931 = 78k
-0.00888 = k
lets calculate how much is left after 18 hours:
Amount(18)
= 790e^(-0.00888*18)
Amount = 673.301 kg
hope this helps</span>
Use photo math it works well
Answer:
C) 320 m^3
Step-by-step explanation:
volume of a rectangular prism is Length times with times hight
10 x 4 = 40 x 8 = 320
