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wariber [46]
3 years ago
7

Police can estimate the speed of a vehicle before the brakes are applied using the formula 0.75d=(s^2)/(30.25) where s is the sp

eed in miles per hour and d is the length of the vehicle’s skid marks. What was the approximate speed of a vehicle that left a skid mark measuring 140 feet?
Mathematics
1 answer:
iren2701 [21]3 years ago
8 0
We know that <span>0.75d=(s^2)/(30.25) , so for d=140ft
0.75 x 140= </span>(s^2)/(30.25)  implies   0.75 x 140 x 30.25)= (s^2), and then
s= sqrt( 0.75 x 140 x <span>30.25)=56.35 miles /hour</span>
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Remember that the x-value of the vertex when an equation is given in standard form can be found with the equation \frac{-b}{2a}. So, we can take the coefficients from the equation and plug them in.

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Now we know that the x-value of the vertex is 8. Next, the equation for the y-value is c-ah^2, where h is the x-value of the vertex (8).

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