1)After a boulder is pushed down a hill, its speed s(t) at time tt is given by the formula s(t)=v+at, where v is the initial velocity and a is the acceleration. If s(2)=16 and s(5)=25, find the initial velocity and acceleration.(round to the nearest tenth)
2) For a particular quadratic function f(x)=ax2+bx+c, f(-3)=-13f(-3)=-13 and f(2)=7. If a=-3, find b and c.
3)With the current, a person can canoe 24 miles in 44 hours. Against the same current, the same person can canoe 18 miles in 6 hours. Find the person's average rate in still water and the average rate of the current