The answer to this question would be: 17 years The <span>interest rate is 3.8% compounded twice a year. The function of the saving account amount would be: f(x)= </span><span>4,790.23* (1+ 0.038/2)^2x </span>f(x)= 4,790.23* (1.019)^2x
Then for f(x)= 9,000 the x value would be: 9,000= 4,790.23* (1.019)^2x 9,000/4,790.23= (1.019)^2x 1.8788= (1.019)^2x <span>2x=34 </span>x=17