michealsfamily
29.07.2019 •
Mathematics
The front of a storage bunker can be modeled by y=-5/216(x-72)(x+72), where x and y are measured in inches. the x axis represents the ground. find the width of the bunker at ground level.
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Ответ:
the bunker is a 3D object, it has a height, with and length, however we're only concerned with the 2D front face, which has a length and width only.
we know the x-axis is the ground level, so the y-axis must be the scale for the length.
if we can find, using the provided model, the x-intercepts, namely where the x-axis gets touched, we can just get the distance between them and that's the ground level width.
keeping in mind that when the graph touches the x-axis, an x-intercept, "y" is 0.
now, the distance from (-72, 0) and (72, 0) is just 72 +72, or 144.
Ответ:
3/10 Smallest
2/5 I
1/4 I
1/3 V
5/6 Largest
Hope this helps :)