Step-by-step explanation:
hey.. everyone please
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Answer:
hypoténuse =  15  in
b ² = 15² - 9²
b ² = 144
b = √144 = 12 
Perimeter =  15 + 9 + 12 = 36 inches 
Step-by-step explanation:
 
        
             
        
        
        
To get a you have to have a on its own side
56a=7/4
divide 56 on both sides
a=56/1 divided by 4/7 (switch 7/4 to 4/7 because you are going from division to multiplication)
a=32
Hope this helped