18= 1/2[g(t- 1)? ] (2)
( 1)/(2) De: 16/9=t? /(t- 1)?
9t? = 16(t- 1)?
7t? -32t+ 16=0
Solve the equation: x=4/7 or t=4.
Carry once (1)
Get g= 196 or g=4.
So there are two solutions to this problem: t=4/7 g= 196.
t=4 g=4