The equation y = –5.131x2 + 31.821x – 3.333 approximates the number of people standing in line to catch a commuter train x hours after 5 a.m. What is the best estimate for the number of people in line at 8 a.m.?

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The equation y = –5.131x2 + 31.821x – 3.333 approximates the number of people standing in line to catch a commuter train x hours after 5 a.m. What is the best estimate for the number of people in line at 8 a.m.?

Mathematics
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8 is apparently 3 hours after 5 right?
77 46 40 32
those are the choices.

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whatever, as the kids say replace \(x\) by \(3\) use a calculator i use this http://www.wolframalpha.com/input/?i=+%E2%80%935.131*3^2+%2B+31.821*3+%E2%80%93+3.333
Thanks! Can you help with the second one?
lol how?
this requires some some of program or way way more arithmetic than i can do we can cheat though
some *sort
i mean do you know the answer?
no let me try to use wolfram
okay thanks.
don't say i never did anything for you note the syntax of what i wrote in wolfram http://www.wolframalpha.com/input/?i=quadratic+%282%2C10.1%29%2C%284%2C7.3%29%2C%286%2C5.9%29%2C%287%2C5.1%29%2C%2811%2C6.3%29%2C%2812%2C8.2%29%2C%2815%2C8.8%29
looks like the last one we could have guessed actually, i can tell you how if you like
thank you so much!
i don't know how to work the wolf thing so thats why im asking you to do them (:
how the hell are you supposed to do this?
i have no idea, and this is supposed to be the "easiest" math.
only the last two make sense the first two are not in the right form i would guess C cause when in doubt, Charlie out, but i guess we can try something this stuff is for computers
should i go ahead and answer?
no!!
it decreases, so the base has to be less than one it is the last one by process of elimination
yay thank you now lets see if they're right..
yep! awesome thanks.
yw
hope you are done!
I have a practical math test and a geometry test but i honestly feel so sick and i hate math so i can't even do them right now.
yeah put it off
"practical math" lol
you familiar with chuck berry?

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