The model below measures the proportion of the normal level of oxygen in a pond, wheretis the time in weeks after organic waste is dumped into the pond. (Round your answers to two decimal places as needed)

O(t) = ((0.7t^2)-t+2)/((t^2)+2)

(a)What will be the percentage of the normal oxygen level after4weeks?

(b)How quickly (in percent per week) is the percentage of the normal oxygen level changing after4weeks?

What does this mean?

At ______ weeks, the percent of the _________ in a pond is increasing at a rate of ______ % per week.

(c)What will be the percentage of the normal oxygen level after5weeks?

(d)Find O(5).

O'(5) = ______________

Interpret

O(5).

At _____weeks, the percent of the __________in a pond is increasing at a rate of ________ % per week.