To find out how fast a tree grows, you can measure its trunk. A giant red oak's diameter was 248 inches in 1965. The tree's diameter had grown to 251 inches in 2005. Find the average rate of change in the diameter of the tree per year

Step-by-step explanation:

Let

y ----> the diameter in inches of the tree

x ----> the number of years since 1965

1965 is the year 0 years

2005 is the year (2005-1965)=40 years

so

we have the ordered pair

(0,248) and (40, 251)

we know that

The average rate of change is the same that the slope o the linear equation

The formula to calculate the slope between two points is equal to

substitute the given values

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.