Question

The population of a Canadian city is modelled by P(x) = 12 t square + 800t + 40000, where t is the time in years. When t=0, the year is 2007.
a) According to the model,what will the population be in 2020?
b) In what year is the population predicted to be 300000?

Answer 1

t=2020-2007
t=???

Answer 2

find the t and plug in the value in function

Answer 3

13

Answer 4

yes

Answer 5

so t be 13

Answer 6

yes t=13

Answer 7

what about part b

Answer 8

p(t)=300000= expressio in the Q u need to solve it

Answer 9

300000=12 t square + 800t + 40000

Answer 10

oh ok

Answer 11

so for this we have to used a quadratic fromula

Answer 12

or maybe factoring if possible

Answer 13

yeah we need to use that

Answer 14

But I have a question related to part a like why we subtract 2020-2007?

Answer 15

we need to find the time

Answer 16

at 2007b t=0
what will be the value of t in 2020

Answer 17

but if we put 2020 instead of t

Answer 18

how ??

Answer 19

in 2007 t=0 it is given in Q

Answer 20

so in 2008 t=1
in 2009 t=2
and so on

Answer 21

ok

Answer 22

hey

Answer 23

yeah ???

Answer 24

I need help with part b

Answer 25

what u got in part b

Answer 26

Like I used the quadratic formula and I get the two answers
The first one which I got is 117.58 and the second is -211