$15.69 is the answer 
Subtract 2.50 from 49.57 and then divide your answer by 3
        
             
        
        
        
The absolute value inequality is given as  |(p - 0.43)I ≤ 0.019
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<h3>How to describe the proportion using the absolute value inequality</h3>
The proportion p = 43% = 0.43
Margin of error = 1.9% = 0.019
The value of the proportion can then be said to lie between 
(0.43 - 0.019) ≤ p ≤ (0.43 + 0.019) 
In order to convert to the absolute inequality we would be having
-0.019 ≤ (p - 0.43) ≤ 0.019
I (p - 0.43)I ≤ 0.019
Read more on margin of error here
brainly.com/question/24289590
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When doing this equation, draw a big X on your paper. At the top of the x you do A times C. At the bottom, you put the B. To factor, you need to find what two numbers MULTIPLY together to equal the A times C, and that add together to get the B.
In all you will get (q+7) (q-6)
        
             
        
        
        
The solution to your problem is as follows:
The tangent line passes through (4,-6), so x = 4 when y = -6 
=> f(4) = -6 
The tangent line will have a constant gradient. 
gradient is m = (-6 - 9)/(4 - 10) => 5/2
Equation is y - 9 = (5/2)(x - 10) 
=> y - 9 = (5/2)(x-10) 
<span>i.e. y = (5/2)(x-10) + 9 
</span>      y = (5/2)x - 25 + 9 =   y = (5/2)x - 16
Now, f '(x) = dy/dx = 5/2
so, f '(4) = 5/2....i.e. gradient is 5/2 whatever the value of x. 
I hope my answer has come to your help. Thank you for posting your question here in Brainly.
        
             
        
        
        
You could do 30,30,20,20
Or 40,40,10,10
Or 45,45,5,5