Try this option:
1. the sides of the biggest triangle are 16; x and √(16²-x²); the sides of the smallest triange are x;5 and y. The smallest triangle ~ the biggest triangle. Using the property of the similar triangles: 

2. according to the Pyphagorean theorem (in the smallest triangle):

answer: y=√55.
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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Answer:
The length of the longer ladder is 35 ft 
Step-by-step explanation:
Please check the attachment for a diagrammatic representation of the problem 
We want to calculate the length of the longer ladder ;
We make reference to the diagram 
Since the two right triangles formed are similar. the ratios of their sides are equal;
Thus;
20/15 = 28/x + 15
20(x + 15) = 15(28)
20x + 300 = 420
20x = 420-300
20x = 120
x = 120/20
x = 6
So we want to calculate the hypotenuse of a right triangle with other sides 28ft and 21 ft 
To do this, we use the Pythagoras’ theorem which states that square of the hypotenuse equals the sum of the squares of the two other sides 
Let the hypotenuse be marked x
x^2 = 28^2 + 21^2
x^2 = 1,225
x = √1225
x = 35 ft 
 
        
             
        
        
        
Answer:
-2
Step-by-step explanation:
 
        
             
        
        
        
If I read that right:
(3/5)/(-4/9) is equal to
(3/5)*(9/-4)
-27/20
-1 7/20