Amusician wants to determine what the people who bought his last album thought about the songs. which choice best represents a sample? a) every person who bought the album. b) 250 girls who bought the album. c) a selection of 250 people who bought the album. d) a selection of 250 people who didn't buy the album.

The federal reserve controls certain interest rates in the united states. investors often try to speculate as to whether the federal reserve will raise or lower rates and by how much. suppose a company conducts extensive interviews with financial analysts, and as a result, predicts that "thefed" will increase rates by an average of 0.25 percentage points every six months for the forseeable future. which type of equation could be used to model the predicted interest rates over the next several years, assuming no other significant changes? a) a linear equation b) a quadratic equation c) a polynomial equation d) an exponential equation