Given:
The geometric sequence is:

1 -4
2 20
3 -100
To find:
The explicit formula and list any restrictions to the domain.
Solution:
The explicit formula of a geometric sequence is:
...(i)
Where, a is the first term, r is the common ratio and
.
In the given sequence the first term is -4 and the second term is 20, so the common ratio is:



Putting
in (i), we get
where 
Therefore, the correct option is B.
Answer:
Step-by-step explanation:
a) Pythagorean theorem,
altitude² + base² = hypotenuse²
h² + (w² - 1)² = (w² + 1)²
h² = (w² + 1)² - (w² - 1)²
{Compare with (a + b)² - (a -b)² = 4ab where a =w² & b = 1}
h² = 4*w²*1
h² = 4w²

b) Area of triangle = 

c) w =2
Area of triangle = 3w = 3*2 = 6
Correct option is:
B. 2
<h2>
Explanation:</h2>
From the double number line shown we can set:

So we can solve this problem by using either equation (3) or (4). So, choosing equation (3):

<h2>Learn more:</h2>
Solving equations: brainly.com/question/7747308
#LearnWithBrainly
Answer:
18 square feet
Step-by-step explanation:
hope this helps :)
<span>im pretty sure it would be 1 in 3 or 1 in 4</span>