<h2>
Hello!</h2>
The answer is:
<h2>Why?</h2>
Since it's a right triangle and we need to know the adjacent side of the triangle, in order to find cos(R), we can use the Pythagorean Theorem.
Pythagorean Theorem formula:
Where:
So, the adjacent side will be:
Now, that we know the adjacent side, we can calculate cos(R), so:
Have a nice day!
The interval given was 33% to 37%
This means that subtracting the margin of error from the percentage of the population that visit the library once a year gives the lower end and adding the margin of error to the percentage of the population that visit the library once a year gives the upper end
Let x denote margin of error and y denotes the percentages of the population that visit the library once a year
we can get the following equations and solve for the values of x and y
Adding eqn1 and eqn2 to gives
Putting the value of y into any of the equations
Thus, the margin of error is
Therefore we enter 2 in the box
10+10=20/ 4×5=20/ 40-20=20/ 80÷40= 20
Cant see the attachment.<span />