12) 2×2×2×2×2
14)(3/5) write it 4 times
16)2×2×2×5×5 and the rest I'm not sure but you should try using photomath :) it gives u the answers and the work!
Answer:
t = ln(0.5)/-r
Step-by-step explanation:
The decay rate parameter is missing. I will assume a value of 4% per day.
The exponential decay is modeled by the following equation:
A = A0*e^(-r*t)
where A is the mass after t time (in days), A0 is the initial mass and r is the rate (as a decimal).
At half-life A = A0/2, then:
A0/2 = A0*e^(-0.04*t)
0.5 = e^(-0.04*t)
ln(0.5) = -0.04*t
t = ln(0.5)/-0.04
t = 17.33 days
In general the half-life time is:
t = ln(0.5)/-r
Answer:
60%
Step-by-step explanation:
6 dimes is 10x6 and a dollar would have 10 dimes so 60%