Ahot air ballon was 240 ft above the ground. it decreased its altitude by 6 1/2 ft per min for 15 min, and then increased its altitude by 9 ft. what was the ballon’s overall change in altitude? ? part a write an expression to model the situation. part b answer. part c what is the air ballon’s elevation. plzz i will give you 100 points

Arectangle has a width of 9 units and length of 40 units. what is the length of a diognal. a. 31 unitsb. 39 unitsc. 41 units d. 49 units

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?