Answer:
Height of the bottom seats is 2 meter.
Explanation:
It has been given in the question seats are located on a slope having gradient
![(1)/(2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ybjkeso7qr5r7js5h0mv9de35dih0sxfpl.png)
We have to find the height h of the bottom seats.
Since gradient =
![tan\theta=(1)/(2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gc6ijfy20ofpxzsjx2nyymy7y4zmwivcye.png)
Therefore, from the figure attached,
![tan\theta =((12-h))/(20)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qc0nhk5lyi6ij9v1yq26ocz2qfi9lgztyi.png)
![(1)/(2)=((12-h))/(20)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/s5nkptz642i7flmendn03gn0wughtg0ex1.png)
12 - h =
![(20)/(2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4494lzsvspg7pdjy5umyit95d5398qcdu8.png)
12 - h = 10
h = 12 - 10
h = 2 m
Therefore, height of the bottom seats if 2 m.