Rewrite the equation by completing the square. x 2 + 6 x + 9 = 0 x 2 +6x+9=0

  (x +3)^2 = 0

Step-by-step explanation:

The square is already complete. We can write the equation as a square:

  (x +3)^2 = 0

The proportion relationship between the distance d, and the time t, that the train has traveled is, d = 45t. So the correct option is D).

Given :

Train travels at a constant speed and has traveled 67.5 miles in the last 1.5 hours.

Solution :

We know that,

Now the distance (d) traveled by the train in time (t) is,

Therefore, the proportion relationship between the distance d, and the time t, that the train has traveled is, d = 45t. So the correct option is D).

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