The height of the tide measured at a seaside community varies according to the number of hours t after midnight. If the height h, in feet, is currently given by the equation h=-1/2t^2+6t-9h=−12t2+6t−9, when will the tide first be at 6 ft?
1 Answer
At
Explanation:
Putting the value of h = 6 in equation
or,
or,
or,
or,
or,
or,
or,
or, #t = [12 + 2 sqrt 6]/2 , [12 - 2 sqrt 6]/2
or,
The first tide will be at morning
The first time will be
This give the time as