On a certain hot summer's day, 677 people used the public swimming pool. the daily prices are $ 1.50 for children and $ 2.00 for adults. the receipts for admission totaled $ 1188.00 .  how many children and how many adults swam at the public pool that day?

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)