The spread of a fungal infection in an ant colony can be modeled by dy dt =
y + 1
2√ t
where t is the time in hours
and y is the percent of the ants infected. At t = 1 only three percent of the ants are infected.
a) Write an equation for the line tangent to the graph of y at t = 1. Use the tangent line to
approximate the percentage of the colony infected at t = 1.2.
b) Find y explicitly in terms of t