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.?

- emmynimmy

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- anonymous

8 is apparently 3 hours after 5 right?

- emmynimmy

77
46
40
32

- emmynimmy

those are the choices.

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- emmynimmy

##### 1 Attachment

- anonymous

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

- emmynimmy

Thanks! Can you help with the second one?

- anonymous

lol how?

- anonymous

this requires some some of program or way way more arithmetic than i can do
we can cheat though

- anonymous

some *sort

- emmynimmy

i mean do you know the answer?

- anonymous

no let me try to use wolfram

- emmynimmy

okay thanks.

- anonymous

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

- anonymous

looks like the last one
we could have guessed actually, i can tell you how if you like

- emmynimmy

thank you so much!

- emmynimmy

##### 1 Attachment

- emmynimmy

i don't know how to work the wolf thing so thats why im asking you to do them (:

- anonymous

how the hell are you supposed to do this?

- emmynimmy

i have no idea, and this is supposed to be the "easiest" math.

- anonymous

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

- emmynimmy

should i go ahead and answer?

- anonymous

no!!

- anonymous

it decreases, so the base has to be less than one
it is the last one by process of elimination

- emmynimmy

yay thank you now lets see if they're right..

- emmynimmy

yep! awesome thanks.

- anonymous

yw

- anonymous

hope you are done!

- emmynimmy

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.

- anonymous

yeah put it off

- anonymous

"practical math" lol

- anonymous

you familiar with chuck berry?

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