Given:
- Function ( Y(x) = 0.03x³ - 0.002x² - 0.0005x + 20 ) feet
- At ( x = 8 ) feet, speed at this point is ( 35 f(t)/s )
- Speed changes at a rate of ( -2 f(t)/s² )
- Coefficient of friction ( = 0.35 )

What is the value of the function ( Y(x) ) at ( x = 8 ) feet?
a) 35
b) 20
c) 1.64
d) 0.3