Part A: f ( t ) = t² + 12 t - 19 =
= ( t² + 12 t + 36 ) - 36 - 18 = ( t + 6 )² - 54 ( the vertex form )
Part B : The vertex : ( - 6, - 54 ). This is the minimum, because the parabola is open up ( a > 0 ).
Part C : The axis of symmetry: t = - 6
Answer:
-1/2
Step-by-step explanation:
It is negative because of the direction the line.
It is one half because it rises one and runs two.
I hope this helps!
The answer is 4.5 hours.
120 miles/2 hours = 60 mph
270-120 = 150 miles
150 miles/60 mph = 2.5 hrs
2 hrs+2.5 hrs = 4.5 hours for the whole trip