Answer:
At least 832 teenargers must be interviewed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
How many teenagers must the firm interview in order to have a margin of error of at most 0.1 liter when constructing a 99% confidence interval
At least n teenargers must be interviewed.
n is found when M = 0.1.
We have that 
So
Rounding up
At least 832 teenargers must be interviewed.
Answer:
B) 120
Step-by-step explanation:
m = miles
$98=$80+$0.15m
$98-$80=$80-$80+$0.15m
$18=$0.15m
$18/$0.15=$0.15m/$0.15
120=m
Juliet drove 120 miles for $98.
(this is a good explanation, I guess)
Answer:
in one minute they rake 
leaves working together.
Step-by-step explanation:
If Maya rakes the leaves in x minutes, then, in one minute she rakes 
leaves.
In the case of Carla, if she rakes the leaves in y minutes, in one minute she rakes 
leaves.
Therefore, to know the portion of leaves they can rake in one minute working together, we need to sum up both of the portions each one of them rake in one minute, this gives us: 
Now, to simplify this expression:
Thus, in one minute they rake leaves.
Remember to use the order of operations! Your answer should be 64 :)
Answer:
65 ÷ n
Step-by-step explanation:
If you already knew the cost of one book, you would do:
cost of 1 book x n = 65
However, you do not know the cost, so you have to do the opposite of multiplying the cost, which is dividing.
