-16 because you need to subtract -4 from -12
Answer:
B. 6 cans for 5.16
Step-by-step explanation:
A. 0.89$ for 1 can
B. 0.86$ for 1 can
C. 0.88$ for 1 can
D. 0.90$ for 1 can
It will take her 6 hours because
3/4=6/8 hours
1/8= 1 hour
I hope this was helpful
Answer:
They will find 69 viruses in 8 hours.
Step-by-step explanation:
The number of viruses after t hours is given by the following equation:
![V(t) = V(0)(1-r)^{t}](https://tex.z-dn.net/?f=V%28t%29%20%3D%20V%280%29%281-r%29%5E%7Bt%7D)
In which V(0) is the initial number of viruses and r is the decay rate, as a decimal.
They start with 500 viruses
This means that ![V(0) = 500](https://tex.z-dn.net/?f=V%280%29%20%3D%20500)
Decay rate of 22% per hour.
This means that ![r = 0.22](https://tex.z-dn.net/?f=r%20%3D%200.22)
So
![V(t) = V(0)(1-r)^{t}](https://tex.z-dn.net/?f=V%28t%29%20%3D%20V%280%29%281-r%29%5E%7Bt%7D)
![V(t) = 500(1-0.22)^{t}](https://tex.z-dn.net/?f=V%28t%29%20%3D%20500%281-0.22%29%5E%7Bt%7D)
![V(t) = 500(0.78)^{t}](https://tex.z-dn.net/?f=V%28t%29%20%3D%20500%280.78%29%5E%7Bt%7D)
How many viruses will they find in 8 hours?
This is V(8).
![V(t) = 500(0.78)^{t}](https://tex.z-dn.net/?f=V%28t%29%20%3D%20500%280.78%29%5E%7Bt%7D)
![V(8) = 500(0.78)^{8}](https://tex.z-dn.net/?f=V%288%29%20%3D%20500%280.78%29%5E%7B8%7D)
![V(8) = 68.51](https://tex.z-dn.net/?f=V%288%29%20%3D%2068.51)
Rounding to the nearest whole number
They will find 69 viruses in 8 hours.