Answer:
Using Pythagorean theory : a²+9²=15²
=> a²=225-81=144
=> a = √144 = 12
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
For window, area 3×2
 =6
For wall, area=20×16
 =320
Area of wall withot window=320-6
 =316
 
        
             
        
        
        
Answer:
21 squares 
Step-by-step explanation:
6+5+4+3+2+1=21
 
        
             
        
        
        
3L is the largest quanity, 2750mL is 2nd largest, and 2.25L is the smallest. hope that helps
        
             
        
        
        
9514 1404 393
Answer:
   y = -1/2x +11/2
Step-by-step explanation:
The slope of the line is ...
   m = (y2 -y1)/(x2 -x1)
   m = (1 -2)/(9 -7) = -1/2
The y-intercept is ...
   b = y -mx
   b = 2 -(-1/2)(7) = 11/2
Then the slope-intercept equation is ...
   y = -1/2x +11/2
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<em>Alternative solution</em>
A general form equation for the line can be ...
   (y1 -y2)(x -x1) -(x1 -x2)(y -y1) = 0
   (2 -1)(x -7) -(7 -9)(y -2) = 0
   x-7 +2y -4 = 0
   x +2y -11 = 0 . . . . . general form equation
   x +2y = 11 . . . . . . . standard form equation
Note that we want the x-coefficient to be positive, so we chose the order of the points to make that be the case.