Answer:
I believe it is the first option
2.7 x 10^-5
Step-by-step explanation:
So.... notice the picture below
we know when y = 140 and x = 240, r = 250
so let's use the pythagorean theorem

now... how much time does the controller have? well, say, plane "y" is going at dy/dt of 140mph, and is 70 miles away, 140 is 2*70, so it can cover those 70 miles in 1/2 hr, and when it does, it'll collide with the other,
so, the controller has that much, less than 1/2 hr
Factor the quadratic equation (3x-4)(x+3). Then set the factors equal to zero.
3x-4=0, solve to get 4/3
x+3=0 x=-3
By definition a function can have only one value of y for any given value of x.
Since B. contains both (-1,2) and (-1,0), y has two values for the same value of x and thus B. cannot be a function...
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The best and most correct answers among the choices provided by the question are:
</span><span>4y − x = −12
2y − x = 16
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Hope my answer would be a great help for you. </span>