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During a pumpkin launching contest, two pumpkins are launched at the same time. The path of pumpkin [tex]$A$[/tex] is modeled by the equation [tex] y = -0.01x^2 + 0.32x + 4 [/tex]. The path of pumpkin [tex]$B$[/tex] is modeled by the equation [tex] y = -0.01x^2 + 0.18x + 5 [/tex].

If [tex] x [/tex] represents the distance the pumpkin traveled in feet and [tex] y [/tex] represents the height of the pumpkin in feet, what does the intersection point of the equations represent?

A. the height at which the pumpkins reach their greatest horizontal distance from the launch site
B. the horizontal distance of the pumpkins from the launch site when they reach the ground
C. the starting height of the pumpkins when they are at the launch site
D. the horizontal distance of the pumpkins from the launch site when their heights are the same


Sagot :

To find the intersection points of the two parabolic paths given by the equations for pumpkins A and B, we need to set their equations equal to each other. The paths of the pumpkins are given by:
- Pumpkin A: [tex]\( y = -0.01x^2 + 0.32x + 4 \)[/tex]
- Pumpkin B: [tex]\( y = -0.01x^2 + 0.18x + 5 \)[/tex]

Setting the equations equal to each other to find the values of [tex]\( x \)[/tex] where the paths intersect:

[tex]\[ -0.01x^2 + 0.32x + 4 = -0.01x^2 + 0.18x + 5 \][/tex]

Simplifying by canceling out [tex]\(-0.01x^2\)[/tex] from both sides:

[tex]\[ 0.32x + 4 = 0.18x + 5 \][/tex]

Subtract [tex]\(0.18x\)[/tex] and 4 from both sides:

[tex]\[ 0.14x = 1 \][/tex]

Solving for [tex]\( x \)[/tex]:

[tex]\[ x = \frac{1}{0.14} \][/tex]

[tex]\[ x = 7.14285714285714 \][/tex]

Now, substituting [tex]\( x = 7.14285714285714 \)[/tex] back into either of the original equations to find the corresponding [tex]\( y \)[/tex]-coordinate. Using the equation for pumpkin A:

[tex]\[ y = -0.01(7.14285714285714)^2 + 0.32(7.14285714285714) + 4 \][/tex]
[tex]\[ y \approx -0.01(51.0204081632653) + 2.285714285714285 + 4 \][/tex]
[tex]\[ y \approx -0.510204081632653 + 2.285714285714285 + 4 \][/tex]
[tex]\[ y \approx 5.77551020408163 \][/tex]

So, the intersection point is at [tex]\( (7.14285714285714, 5.77551020408163) \)[/tex].

### Interpretation:
The intersection point [tex]\((7.14285714285714, 5.77551020408163)\)[/tex] of the two parabolic paths means:
- At a horizontal distance of approximately 7.14 feet from the launch site, both pumpkins have the same height, which is approximately 5.78 feet.

Thus, the correct interpretation among the given choices is:

The horizontal distance of the pumpkins from the launch site when their heights are the same.
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