4. A Thanksgiving Day promotion included a $1.00 mail-in rebate for the purchase of a turkey weighing at least 20 lbs. Esther Rothert purchased a 22-Ib turkey at $1.79 a pound. What did the turkey cost after the rebate if an envelope costs $0.20 and a Forever postage stamp
costs $0.417

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is