Atmospheric pressure decreases by about 11.8% for every 1000 meters you climb. the pressure at sea level is 1013 millibars (a unit of pressure). construct an exponential model to represent the atmospheric pressure at a given altitude in thousands of meters. use your model to determine the atmospheric pressure at an altitude of 4000 meters.
(express your answer in millibars rounded correctly to the nearest tenth.)

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?