Answer:
You can check the answer by yourself after seeing the below answer.
Step-by-step explanation:
A sequence is geometric only if has common ratio i.e. 
whiere a1,a2 and a3 are first,second and third term of the sequence respectively.
1) Common ratio 
Explicit formula 
Now using the above formula, we can find 
2) Here
so this is not geometric sequence so no need to proceed further.
3) Common ratio 
Explicit formula 
Now using the above formula, we can find 
4) Common ratio 
Explicit formula 
Now using the above formula, we can find 
5)Common ratio 
Explicit formula 
Now using the above formula, we can find 
6)Common ratio 
Explicit formula 
Now using the above formula, we can find 
The two triangles formed will be ADB and BCD
Hope this helps :)
Answer:
<h2>7 square units</h2>
Step-by-step explanation:
As you can observe in the image attached, we know the coordinates of each vertex of the triangle.
To find the area using only its vertex coordinates, we need to use the following formula
Where the coordinates are
Replacing coordinates, we have
![A=\frac{1}{2}[1(0 -5)+4(5 -1 )+3(1-0 ) ]\\A=\frac{1}{2} [-5+16+3]=\frac{1}{2}(14)\\ A=7](https://tex.z-dn.net/?f=A%3D%5Cfrac%7B1%7D%7B2%7D%5B1%280%20-5%29%2B4%285%20-1%20%29%2B3%281-0%20%20%29%20%20%5D%5C%5CA%3D%5Cfrac%7B1%7D%7B2%7D%20%5B-5%2B16%2B3%5D%3D%5Cfrac%7B1%7D%7B2%7D%2814%29%5C%5C%20A%3D7)
Therefore, the area of the triangle is 7 square units. So, the right answer is the second choice.
The answer for the problem is -13x+8
