The area of the trapezoid is 4.5cm
Do you mean ^2? cause if so... B don't really need crit points to solve, the parabola has a positive slope before x =2
Let x be the speed.
Maximum is 65 so x needs to be less than or equal to 65.
The minimum is 45, so x also has to be greater than or equal to 45
45 <= x => 65
With a square, all you need to do to find the length of one side is to divide the perimeter by 4. If it is the area you are calculating, then you need to find the square root. For that equation the answer is 24.
