The question is an illustration of a division model.
The boxes will be completed with: 1650, 231, 50 and 7
The expression is represented as:

Express 1881 as 1650 + 231.

Split

Evaluate each division


The above illustration means that, the boxes will be completed with the following numbers
See attachment for proper illustration
Read more about division models at:
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Answer:
8 units by 10 units
Step-by-step explanation:

Equilateral triangle is a triangle with the 3 sides of the same length, and the 3 angles with the same measures/degree.
The formula to find the area of a triangle is base x height/2 , you do have the base (40), but you need the height. To find the height of an equilateral triangle you use the formula: side/2 x radical3, this way u'll find the height and therefor can calculate the area of the triangle.
Hope that helped :)
Number 3 it is a factor because if u expand you will see that x+6 will be the answer
The average of 5, 7, 12, and 12, is (5 + 7 + 12 + 12)/4.
(5 + 7 + 12 + 12)/4 = 36/4 = 9.
The average is 9.