The best fitting line relating the dependent variable y to the independent variable x, often called the regression or least-squares line, is found by minimizing the sum of the squared differences between the data points and the line itself.

Which statement(s) verify that $f(x)=9x-1$ and $g(x)=\frac{1}{9}(x+1)$ are inverse?

A) $f(x)\cdot g(x)=(9x-1)\frac{1}{9}(x+1)=-1$
B) $f(g(x)\; )=\left(9\left(\frac{1}{9}x\right)+1\right)-1=x,g(f(x)\; )=\frac{1}{9}(9(x-1)+1)=x$
C) $f(g(x)\; )=\left(9\left(\frac{1}{9}x\right)+1\right)-1=x;g(f(x)\; )=\frac{1}{9}((9x-1)+1)=x$
D) $f(g(x)\; )=9\left(\frac{1}{9}(x+1)\right)-1=x;g(f(x)\; )=\frac{1}{9}((9x-1)+1)=x$
E) $\frac{f(x)}{g(x)}=\frac{9(x-1)}{9(x+1)}=-1$

A $3,000 payment is scheduled for 6 months from now. If money is worth 6.75%, calculate the payment's equivalent values at two-month intervals beginning today and ending one year from now.

Terri and Larry plan to invest $5,000 at the end of each year in an individual retirement account earning a rate of return of 11% compounded annually. What will be the value of the account after 15 years?

A) $119,864
B) $172,027
C) $198,215
D) $214,739
E) $359,543

Determine the unknown value for the following deferred annuity. The annuity is understood to be an ordinary annuity after the period of deferral.

Real limits are ______.

A) the values of a variable that fall halfway between the top of one interval and the bottom of the next interval
B) the smallest value of a variable that would be grouped into a particular interval
C) the largest value of a variable that would be grouped into a particular interval
D) a small number of intervals that provide the frequencies within each interval