The average number of welfare cases during 1998-2003 in a city given by the model y= -118x^2 -108x +14,906, where x is the number of years after 1995.
a) Find the value of y when x=7

Question

The average number of welfare cases during 1998-2003 in a city given by the model y= -118x^2 -108x +14,906, where x is the number of years after 1995.
a) Find the value of y when x=7

anonymous · Answer

put instead of x 7:
y=-118(49)-108(7)+14906=...

anonymous · Answer

How many welfare cases were there in 1999, according to this model?

anonymous · Answer

if x is the number of years after 1995
so what is x when the year is 1999?

anonymous · Answer

4?

anonymous · Answer

good plug in 4 for x in the equation and find y

anonymous · Answer

The answer in my calculator keeps saying 12586, that can't be right

anonymous · Answer

why can't it be right?

anonymous · Answer

Because when I plugged in 7 previously it was 8368, 4 can't be more

anonymous · Answer

you are forgetting that according to the equation the greater x is ,the less y;because of the - sighn at the beginning

anonymous · Answer

Oh yeah. Thank-you again

anonymous · Answer

np

anonymous · Answer

too bad I don't have a teacher that helps me understand like you did