Answer:
<h3>
a₈₄ = 1655 </h3>
Step-by-step explanation:
15-(-5) = 20 and 35-15=20 so d=20

There would be 14 female and 7 male, so the total number of students is 21.
X should also be 50° because they are corresponding angles.
Answer:
C: 41x + 16.
Step-by-step explanation:
In order to simplify this, you must distribute the negative sign into the 8x+35. You can get rid of the parentheses for 49x+51 since it serves no purpose.

Combine like terms:


Answer:
The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.
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.

The lower end of the interval is the sample mean subtracted by M. So it is 18.5 - 0.1 = 18.4 gallons per day.
The upper end of the interval is the sample mean added to M. So it is 18.5 + 0.1 = 18.6 gallons per day.
The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.