The function f(x) = 2.75x? - 36.9x +104.9 describes the united states trade balance with mexico in billions of dollars
for the period 1994-1998 (1994 corresponds to x = 4).
1. according to the function when was the u. s. deficit greatest (largest negative value)?
2. when was trade balanced (y = 0) for the period 1994-1998?
3. if the function continues to model u. s.-mexican trade, will trade be balanced again? when?

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Which expression gives the exact value of x?