Answer:
(5/2, -7/2)
Step-by-step explanation:
The midpoint is the average value of each coordinate
(1+4)/2 , (-1-6)/2
<span><span><span>−6</span>+14</span>+<span>2<span>(<span>60−<span>9<span>(<span>1+3</span>)</span></span></span>)
</span></span></span><span>=<span>8+<span>2<span>(<span>60−<span>9<span>(<span>1+3</span>)</span></span></span>)
</span></span></span></span><span>=<span>8+<span>2<span>(<span>60−<span><span>(9)</span><span>(4)</span></span></span>)
</span></span></span></span><span>=<span>8+<span>2<span>(<span>60−36</span>)
</span></span></span></span><span>=<span>8+<span><span>(2)</span><span>(24)
</span></span></span></span><span>=<span>8+48
</span></span><span>=<span>56</span></span>
the volume of the box is L x W x H so it should be 7x5x4=140
Alll angles in a quadrilateral add to 360
so
missing angle=x
108+99+78+x=360
285+x=360
minus 285 from both sides
x=75
missing angle is 75 degrees
