Question

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.?

Answer 1

8 is apparently 3 hours after 5 right?

Answer 2

77

46

40

32

Answer 3

those are the choices.

Answer 4

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

Answer 5

Thanks! Can you help with the second one?

Answer 6

lol how?

Answer 7

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

Answer 8

some *sort

Answer 9

i mean do you know the answer?

Answer 10

no let me try to use wolfram

Answer 11

okay thanks.

Answer 12

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

Answer 13

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

Answer 14

thank you so much!

Answer 15

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

Answer 16

how the hell are you supposed to do this?

Answer 17

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

Answer 18

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

Answer 19

should i go ahead and answer?

Answer 20

no!!

Answer 21

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

Answer 22

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

Answer 23

yep! awesome thanks.

Answer 24

yw

Answer 25

hope you are done!

Answer 26

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.

Answer 27

yeah put it off

Answer 28

"practical math" lol

Answer 29

you familiar with chuck berry?