Let's say that ground level is 0. When she goes down to the basement, she is going -12 feet since each flight of stairs is12 feet. Then she goes up 12 more feet= -12+12=0. She is back at ground level. Then she goes up another 12 feet= 0+12= 12. So I believe the answer is 12 feet.
Answer: I think the answer is #1
1.7 = 1 7/10 = 17/10
3 2/10 = 32/10
32/10 - 17/10 = 15/10 = 1 5/10 = 1.5 feet above ground
I'm not sure but I would go with c
20= 1,2,4,5,10,20
36=1,2,3,4,6,9,12,18,36
48=1,2,3,4,6,8,12,16,24,48
