Answer:
S₃ = 37
Step-by-step explanation:
given a₁ = 16 and r = [tex]\frac{3}{4}[/tex] , then
a₂ = a₁ × [tex]\frac{3}{4}[/tex] = 16 × [tex]\frac{3}{4}[/tex] = 12
a₃ = a₂ × [tex]\frac{3}{4}[/tex] = 12 × [tex]\frac{3}{4}[/tex] = 9
then
S₃ = a₁ + a₂ + a₃ = 16 + 12 + 9 = 37