A rectangle is twice as long as it is wide. Its width is 5 1/2 cm. Find the perimeter of the rectangle.
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<h3>Hello!</h3>
In order to find the vertex of a parabola, we use the following formula:
Remember, a parabola looks like so:
Now we know what a and b stand for.
In this case, b is -4, and a is -1:
Simplify:
Divide:
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