· The line plot shows the numbers of hours volunteers worked at the food pantry. PLSS HELP​

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

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)