The pattern here is doubling each number.
Sequence to the seventh term:
Answer: c) 64
As speed increases, height increases :)
X+12y=68
x=8y-12
(8y-12) +12y=68
20y-12=68
20y=80
y=40
x=8(40)-12
x=320-12
x=308
*3-----*3 1/4-----*3 1/2-----*3 3/4-----*4-----*4 1/4-----*4 1/2-----*4 3/4-----*5