Question 13 (5 points) Two elevators begin descending from the same height. Elevator A has descended 4 feet after one second, 9 feet after two seconds, 14 feet after three seconds, and so on. Elevator B has descended 3.5 feet after one second, 6.5 feet after two seconds, 9.5 feet after three seconds, and so on. How many feet would each elevator descend in 10 seconds? A: 59 At; B: 36.5 At O A: 49 ft; B: 30.5 ft O A: 85 ft; B: 72 ft O A: 54 ft; B: 33.5 ft Question 14 (5 points) Write the expansion of each expression using sigma notation. (-5m - 7/2) 19 O 18 ( - 5m ) " ( - 7n ) 10 - 7 Oz 18 ( - 5 m ) 10 - 7 ( - 730 ) " O 19 " ( - 5m ) 10 - 7 ( - 7n ) ' O 19 (-5m) 19-7 (-712)"Question 15 (5 points) Find the specified ath term of each geometric sequence. a4 = 10, r = 2, n =9 O 32 O 160 O 320 2560 Question 16 (5 points) Find the sum of an infinite geometric series in which a, = 34 and y = -0.05. Round to the nearest hundredth if necessary. 54 34.5 OO 35.79 32.38