Answer:
this is not an answer but I will post one, could you tell us what the answer choices are?
Step-by-step explanation:
it would help with the answers.
Answer:
291.63 ml
Step-by-step explanation:
200/72 2.7778 half lives
(1/2)^2.77777 = .1458 or 291.63 ml
You multiply both equations by a factor to get them to have the same X coefficient, the first by 5 and the second by 2, you get 10x-15y=5 and 10x+8y=28. Then you subtract the equations to get 23y=23, y=1, plug y into first equaition, x=2. Answer is (2,1)