An apartment building has a parking lot with 12 parking spaces for tenants. At 6.M., all 12 spaces were full
. At 8 A. M., the number of cars in
the lot had decreased by 4. By 9 A. M., there were no cars left in the lot.
Use the number line to show each change in the number of cars in the
parking lot. What integer represents the change in the number of cars
between 8 A. M. and 9 A. M.?

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?