The increase of the radius is a linear increase since we have the constant rate of 0.07 inches per second
The equation for a linear growth/decay is given by the form

where

is the rate of increase and

is the value of

when

We have

when
So the equation is 
The length of the radius when

seconds is


inches
Three pounds is less than 50 ounces. 3 pounds =48 ounces
Answer:
600
Step-by-step explanation:
105/7 * x/40
7x=4,200
x=600

For each time period, each time "t" increases by one, the population will be multiplied by 4.