QUESTION IMAGE
Question
the parabolic arches that support the roof of the dallas convention center can be modeled by the graph of ( y = - 0.0019x^{2}+0.71x ) where ( x ) and ( y ) are the archs horizontal and vertical measurements in feet.
a) identify the variables.
( x ): select an answer and ( y ): select an answer
b) what is the height at the highest point of the arch? feet tall
c) if a support needs to be placed 50 feet from each edge, how tall does the support need to be in order to reach the arch? feet
d) what does the point ( (10,6.91) ) on the function mean in context of the situation? select an answer
e) meg is the foreman in charge of the team placing support posts 10 feet from the edge. the posts that were delivered are 7.25 feet long. will these posts fit? explain your reasoning. select an answer
question help: message instructor
a)
En el contexto del problema, se dice que \(x\) y \(y\) son las mediciones horizontales y verticales del arco respectivamente.
Step1: Encontrar el vértice de la parábola
La ecuación de la parábola es \(y = - 0.0019x^{2}+0.71x\), de la forma \(y = ax^{2}+bx + c\) con \(a=-0.0019\), \(b = 0.71\) y \(c = 0\).
El valor de \(x\) en el vértice se calcula con la fórmula \(x=-\frac{b}{2a}\).
$$x=-\frac{0.71}{2\times(- 0.0019)}=\frac{0.71}{0.0038}\approx186.84$$
Step2: Calcular el valor de \(y\) en el vértice
Sustituir \(x = 186.84\) en la ecuación \(y=-0.0019x^{2}+0.71x\)
$$y=-0.0019\times(186.84)^{2}+0.71\times186.84$$
$$y=-0.0019\times34909.1856 + 132.6564$$
$$y=-66.32745264+132.6564\approx66.33$$
Step1: Encontrar los límites de \(x\)
Para encontrar los límites de \(x\) (donde \(y = 0\)), resolvemos la ecuación \(0=-0.0019x^{2}+0.71x\)
Factorizando: \(x(-0.0019x + 0.71)=0\)
Soluciones: \(x = 0\) y \(x=\frac{0.71}{0.0019}\approx373.68\)
Step2: Calcular \(x\) para la posición del soporte
Si el soporte está a 50 pies de cada borde, entonces \(x=50\) o \(x = 373.68-50=323.68\)
Sustituir \(x = 50\) en \(y=-0.0019x^{2}+0.71x\)
$$y=-0.0019\times50^{2}+0.71\times50$$
$$y=-0.0019\times2500 + 35.5$$
$$y=-4.75+35.5 = 30.75$$
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\(x\): horizontal measurement (en pies) y \(y\): vertical measurement (en pies)