Area of a circle = pi * r^2
Radius (r) = ½ * diameter
½ * 10 = 5
A= pi * 5^2
25 * pi = 78.54 sq inches
10.99 / 78.54 = about 14 cents per sq in (13.99)
[67.9 %, 82.1 %] is the 95% confidence interval for the proportion of test-takers answering the question correctly. So we have [67.9 %, 82.1 %] In a random sample of 144 test-takers with 75% answered the question correctly. So the answer in this question is [67.9 %, 82.1 %].
A = LW
Divide both sides by L (To isolate W)
W = 
<span>8-5x=8+2x is to be solved for x.
Group the x terms together: </span><span>8=8+2x+5x => 0 = 7x => x = 0</span>
