Answer:
a)  4(t - r) = 4(6 - 2.5) = 4 x 3.5 = 14
b)  4t - r = (4 x 6) - 2.5 = 24 - 2.5 = 21.5
c)  2(3t - 10) = 2(3 x 6 - 10) = 2(18 - 10) = 2 x 8 = 16
d)  (t - 2)² = (6 - 2)² = 4² = 4 x 4 = 16
e) cannot decipher the equation
f)  6r + t = 6 x 2.5 + 6 = 15 + 6 = 21
 
        
                    
             
        
        
        
the picture in the attached figure
we know that
area of the triangle is equal to

in this problem
A=47 in²
b=x
h=x
so

therefore
the answer is
x=9.7 in
 
        
                    
             
        
        
        
Sonia practices for 96 mins (1 hour 36mins ) 0.8 = 80%