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A train covers 168 miles at a speed of 42 mph. How much time dod it take?
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Answer:
A) x=5 or -11
Step-by-step explanation:
The given equation is:
The most suitable method so solve this quadratic equation is the square root method.
We take square root of both sides to obtain:
We now split the plus or minus sign to get;
This simplifies to:
The correct choice is A