I think its 208cm<span>² ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, </span>
Answer:
140 cubic cm
Step-by-step explanation:
Find the area of the triangular base: = 11.7.
Multiply 11.7 square cm with 12 cm to get 140.4 cubic cm.
Answer:
Therefore 53.05 mg will remain of the given radioactive substance after 35 hours.
Step-by-step explanation:
Radioactive Decay:
Integrating both sides
[ ]
When t=0, = initial amount
Therefore the decay equation is
Given that, = Initial amount of the radioactive substance= 140 mg
After 25 hours, 70 mg of substance remains.
N= 70 mg, t=25 hours
[ ]
The decay equation becomes
Now putting t= 35
= 53.05 mg
Therefore 53.05 mg will remain of the given radioactive substance after 35 hours.