



 
Joanne, For part (a), you can substitute 80 in for d in the equation. So you have 80 = 0.0056 s^2 + 0.14 s and you can solve this Part (b) is much easier than (a): you substitute 120 in for s and your equation is d = 0.0056 (120)^2 + 0.14 (120) and you can just calculate d. Cheers,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 