SOLUTION: Suppose that N= sqrt of x (only x) +3 (not under sqrt sign) models the number of cases of an infection, in millions, of a disease x years from now. a) approximately how many cas

Algebra ->  Square-cubic-other-roots -> SOLUTION: Suppose that N= sqrt of x (only x) +3 (not under sqrt sign) models the number of cases of an infection, in millions, of a disease x years from now. a) approximately how many cas      Log On


   



Question 96858This question is from textbook Blitzer College Algebra
: Suppose that N= sqrt of x (only x) +3 (not under sqrt sign) models the number of cases of an infection, in millions, of a disease x years from now.
a) approximately how many cases of the infection will there be 9 yrs from now?
b) In how many years will there be 5 million cases?
** This is not an equation from our next book, it is one that our instructor gave us as apart of a seperate assignment
This question is from textbook Blitzer College Algebra

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose that N = sqrt of x (only x) + 3 (not under sqrt sign) models the number of cases of an infection, in millions, of a disease x years from now.
:
N+=+sqrt%28x%29+%2B+3
:
a) approximately how many cases of the infection will there be 9 yrs from now?
N+=+sqrt%289%29+%2B+3
N = 3 + 3
N = 6 million cases
:
b) In how many years will there be 5 million cases?
sqrt%28x%29+%2B+3+=+5;
sqrt%28x%29+=+5+-+3
sqrt%28x%29+=+2
Square both sides:
x = 4 years