It's the Arithmetic series. I hope this has helped.
Answer:

Step-by-step explanation:
Given
The attached triangle
Required
Determine the value of x
x represents the height of the triangle.
And the area of a triangle is calculated as:

Where



The expression becomes



Divide through by 2


I think it's 42 since 7x6=42
Answer:
1/24
Step-by-step explanation:
1/6 / 4
1/6 x 1/4
1/24