If we are going to analyze the problem very well, the equation that we will be able to make would be: 2x + 6y = 72
72 is the oz of water conditioner to use in his fish tanks.
small tanks would require 2 oz of conditioner
 large tanks would require 6 oz of conditioner
There is only one point which satisfy's the above equation.That is the points of (0, 12) and (36, 0)
        
             
        
        
        
Step-by-step explanation:
To find a ratio, you have to divide a next terms with before terms. 
A1 = 35/2
A2 = 7
ratio = A2 ÷ A1
ratio = 7 ÷ 35/2
ratio = 7 × 2/35
ratio = 14/35 = 0,4
Ratio = 0,4
 
        
             
        
        
        
The greatest common factor is 2z^3. 
In order to find the greatest common factor, always start with the coefficient of the lowest term. Let's see what the factors of 14 are. 
Factors of 10: 1, 2, 5, 10
Now we look to see which are also factors of the next highest number. 
Factors of 14: 1, 2, 7, 14
Only 1 and 2 are similar factors. Since 2 is also a factor of 70, 2 in the coefficient of our greatest common factor. 
Next we look for the term with the least number of z's. 14z^3 is the least number of z's. This means we can take out z^3. Giving us the final answer of 2z^3.
 
        
             
        
        
        
Answer:
Pythagoras theorem. 
hypotenuse²=height²+base²
x²=15²+12²
x²=225+144
x²=329
x=329½
x=19.20