Answer:
Step-by-step explanation:
The temperature at 7:00 pm is:
Tyler can rake 1/3 of a yard in 1/5 of an hour.How many yards can he rake in one hour?
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The components operate independently, so the probability of "total" system failure is the same as the product of each probability of component failure. That is, if 
denotes the event that component 
fails, then
The are independent and identically distributed, so 
for all 
. So
The
Use the formula below.
Let A_0 = 1 because you just want to know the percentage left. Usually that's the initial amount.
t = 15, the number of years past. n = 22, the half-life.
Let A_0 = 1 because you just want to know the percentage left. Usually that's the initial amount.
t = 15, the number of years past. n = 22, the half-life.