Answer:
x=3
Step-by-step explanation:
Answer:
Step-by-step explanation:
For a first order decay, fraction remaining = 0.5n where n = number of half lives elapsed.
fraction remaining = 55% = 0.55
0.55 = 0.5n
log 0.55 = n log 0.5
-0.2596 = -0.301 n
n = 0.8625 = # of half lives elapsed
0.8625 half lives x 2.5 billion years/half live = 2.16 billion years have elapsed = age of the rock
b) 0.15 = 0.5n
log 0.15 = n log 0.5
-0.824 = -0.301 n
n = 2.74 half lives
2.5 billion years/half life x 2.74 half lives = 6.85 billion years = age of rock
Answer:
C. The normal distribution can be used because the original population has a normal distribution.
Step-by-step explanation:
When the original population has a normal distribution, we can use the normal distribution to solve the exercise.
In this problem, we have that:
The original population are the adult females.
The problem states that:
The overhead reach distances of adult females are normally distributed with a mean of 202.5 cm and a standard deviation of
7.8 cm.
So the correct answer is
C. The normal distribution can be used because the original population has a normal distribution.
Answer:
Angle = 45
Supplement = 135
Complement = 45
Step-by-step explanation: