Answer:
im pretty sure its 67, sorry if I'm wrong
Answer:
n=42
Step-by-step explanation:
1/2n=21
2•(1/2n=21)
n=42
Do you already know how to do it, or checking your answer?
Answer:

Step-by-step explanation:
<u><em>The picture of the question in the attached figure</em></u>
we know that
The area of a trapezoid is equal to
![A=\frac{1}{2}[b_1+b_2]h](https://tex.z-dn.net/?f=A%3D%5Cfrac%7B1%7D%7B2%7D%5Bb_1%2Bb_2%5Dh)
where
b_1 and b_2 are the parallel bases
h is the perpendicular distance between the parallel bases
we have

substitute
![A=\frac{1}{2}[4.5+9]7](https://tex.z-dn.net/?f=A%3D%5Cfrac%7B1%7D%7B2%7D%5B4.5%2B9%5D7)
