Answer: She took 6 yoga classes
Step-by-step explanation: So first
Subtract
$43.50 - $19.50 = $24
Carry then Divide
$24 / 8 = 6 Classes
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Let the three consecutive integers be x , x+1 ,x+2 
Given, sum of three consecutive integers = -126 
 x +x+1+ x+2 = -126 
3x +3 = -126 
3x = -126 -3 
3x = -129 
x = -129/3 
x = - 43 
x +1 = -42 
x +2 = -41
        
             
        
        
        
A(n) = –3 • 2⁽ⁿ⁻¹⁾
for n = 1 ,  A₁ = -3.(2)⁰ = -3
for n = 2 ,  A₂ = -3.(2)¹ = -6
for n = 3 ,  A₃ = -3.(2)² = -12
for n = 4 ,  A₄ = -3.(2)³ = -24
...........................................
for n = 8 ,  A₈ = -3.(2)⁷ = -384
        
             
        
        
        
Answer is highlighted in brown. Hope this helps.