Mackenzie performed a chemistry experiment in which she divided 1/2 of a box of baking soda evenly among 4 bottles. She then added vinegar and water to each bottle to make them bubble up like volcanoes. How much baking soda did she put in each bottle? Write your answer as a fraction or as a whole or mixed number. please help hurry!
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The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices