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Answer:
45 is the answer
Step-by-step explanation:
first you have to know the sum of interior angle of that pentagon (540)
then add the all angle. 
148 + x + 112 + 90 + 3x + 10 = 540. 
or, 360 + 4x = 540
or, 4x = 540 - 360
or, 4x = 180
or, x = 180/4
or, x = 45
hope it will help you☺✌
 
        
                    
             
        
        
        
Solve the equation for 
t
t
 by finding 
a
a
, 
b
b
, and 
c
c
 of the quadratic then applying the quadratic formula.
t
=
10
−
h
+
√
h
2
−
20
h
+
160
10
t
=
10
-
h
+
h
2
-
20
h
+
160
10
t
=
10
−
h
−
√
h
2
−
20
h
+
160
10
        
             
        
        
        
Anything (except 0) to the 0 power is equal to 1.
8^0  = 1
(-8)^0 = 1
24781297429879741^0 = 1
 
        
             
        
        
        
X=3 
x is the width of the sidewalk
The outside dimensions of the walkway are 12 + 2x by 8 + 2x
The total area is (12 + 2x)(8 + 2x)
The total area minus the area of the pool should be equal to the area of the pool
Hoped this helped!