Which expression is equivalent to 4(3n-5)
2 answers:
Answer: <em>12n-20</em>
Step-by-step explanation:
<em>4(3n - 5)</em>
<em>Apply the distributive law: a(b-c) = ab-ac</em>
<em>a=4 b=3n c=5</em>
<em>Simplify 4 · 3n - 4 · 5: </em><em>12n-20</em>
(4 · 3n) - (4 · 5)
man this is taking forever to write
Multiply the numbers 4 · 3 =12
=12n - 4 · 5
Multiply the numbers: 4 · 5 = 20
⇒12n - 20
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Answer:
a) The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.
b) No, it is unlikely that smoking habits and waking up early to go to the gym on Saturday are independent.
Step-by-step explanation:
To calculate the expected numbers of smokers in a sample with size n=140 and proportion p=12%, we use the expected value of the binomial distribution:
The expected number of smokers in a random sample of 140 students from this university is 16.8 smokers.
If we take a sample at the opening of the gym, the sample is not expected to be representative of the population of the students. Most of the students that go to the gym usually have healthy habits, so the proportions of smokers is expected to be lower than the average of the university population.
Answer:
True
Step-by-step explanation:
First, we need to recognize that
Now, we can try to solve
Multiply each side by
As we end up with an answer that cannot be true, we know that there is no solution.
Another method to solve this would be graphing the function
When graphed, it can be seen that there is an asymptote at x=0 meaning that there is no value for x=0.