he equation y = -4.290x2 + 612.6x - 21773 models the number y of people surveyed who felt comfortable at temperature x (in Fahrenheit). What temperature made the greatest percent of people comfortable?

Select one:
a. 76.7
b. 71.4
c. 82.4
d. 61.2

Question

he equation   y = -4.290x2 + 612.6x - 21773    models the number y of people surveyed who felt comfortable at temperature x (in Fahrenheit). What temperature made the greatest percent of people comfortable?

Select one:
a. 76.7
b. 71.4
c. 82.4
d. 61.2

1645323 · Answer

so y=-4.290(0)^2 + 612.6(0) -21773? and solve ?

1645323 · Answer

@Boblovesmath

anonymous · Answer

@1645323  No my answer is wrong I am sorry I don't know how to solve it.

anonymous · Answer

@1645323  wait I got it now.

anonymous · Answer

because the coefficient is negative the parabola has a maximum at the vertex. Solve for the vertex, and the x value is your answer.

anonymous · Answer

I think a good way is to back solve this, plug in all the values of x into the formula and see which x value gives you the highest y. because the question is asking you to find the maximum number of people. Hope this helped.