Just work with it as seperate triangles and then add them up.
B, there are 1000m in a km.
35 x 20 dollars= 700 dollars. Total cost of all tickets equals 700 dollars
1407.43cm³ V=πr2h=π·82·7≈1407.43351cm³
Answer:
we have:

=> r²h = 10.18 = 9.20 = 5.36 = 6.30 = 4.45 = 12.15
=> only r²h = 5.36 satisfy the problem
=> h = 5
h = 5 r = 6
h = 5 r = 6=> d = 12