Answer:
n= 1
Step-by-step explanation:
-3n + 15 =12
-15. -15
-3n= - 3
÷-3 ÷-3
n= 1
The equation to represent the relationship of the weights shown on the scale s 
The weights are given as:


The total weight on one side, where there are 4 small squares and 3 large squares is:



The total weight on the other side, where there are 2 small squares, 2 large squares and 1 triangle is:





The weight of the triangle is x.
So, we have:

The weights on both sides are equal, because the scale is balanced.
So, we have:

Hence, the equation is 
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Question 1 - 37 students took the test
Question 2 - 16 students scored between 20 and 40 points
- Ari -
Answer:
Y=2x-4
Step-by-step explanation: