Answer:
The correct answer is "
".
Step-by-step explanation:
Given:
n = 21
s = 3.3
c = 0.9
now,


⇒
=
= 
⇒
= 
hence,
The 90% Confidence interval will be:
= 
= 
= 
= 
Area of triangle = <em>A(t) </em>= 1/2(base x height)
Area of square = <em>A(s) = </em>base x height
<em>A(s) </em>= 2 x 2 = 4
<em>2(A(s))</em> = 2(1/2(2)(2) = 2(1/2(4)) = 2(2) = 4
Add the two areas together
4 + 4 = 8
8 units² is your answer
Hello!
I believe that 8 cubes are needed to build the given figure
I hope this helps!