Which set of ordered pairs does not represent a function? \{(-3, -9), (7, 9), (9, 1), (7, 3)\}{(−3,−9),(7,9),(9,1),(7,3)}
\{(-3, 8), (-6, 5), (-5, -6), (1, -6)\}{(−3,8),(−6,5),(−5,−6),(1,−6)}
\{(3, 1), (-2, -9), (6, -9), (4, 6)\}{(3,1),(−2,−9),(6,−9),(4,6)}
\{(4, 3), (-4, 4), (-2, -5), (6, 4)\}{(4,3),(−4,4),(−2,−5),(6,4)}

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

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)

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)