Question

the function D(x) models the cumulatie number of deaths from a diease x years after 1984. Estimate the year when there were 88,000 deaths

Answer 1

are you going to tell us what the function is?

Answer 2

i dont know

Answer 3

you need to tell us what the function D(x) is if you want us to estimate something with it.

Answer 4

the function

Answer 5

the function D(x) models the cumlative number of deaths , this is all the question says...

Answer 6

then how is it possible to estimate the year there were 88000 deaths?!

Answer 7

there must be a definition of D(x). look around.

Answer 8

D(x)= 3332x^2+5060x+5855 sorry I am confused, i have been working on this all day...

Answer 9

OK, so you need to find the first year D(x) exceeds 88000, yes?\[3332x^2 + 5060x + 5855 = 88000\]\[3332x^2 + 5060x - 74145 = 0\]Use the quadratic formula to solve for x.

Answer 10

yes

Answer 11

or do you want the number of deaths in a particular year, not the cumulative number that year?

Answer 12

ti appreciate your patience, but the question ask me to estimate the year when there were 88,000

Answer 13

right. so then take the derivative to get rate of change and get 6664x + 5060. set that equal to 88000 and get:
6664x + 5060 = 88000
6664x = 82940
x = 12.44