Question 96858
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(x) + 3}}}
:
a) approximately how many cases of the infection will there be 9 yrs from now?
{{{N = sqrt(9) + 3}}}
N = 3 + 3
N = 6 million cases
:
b) In how many years will there be 5 million cases?
{{{sqrt(x) + 3 = 5}}}; 
{{{sqrt(x) = 5 - 3}}}
{{{sqrt(x) = 2}}}
Square both sides:
x = 4 years