Question

The diameter of a birch tree is proportional to its age. Use the graph to determine how long it takes for a birch tree to reach a diameter of 42 inches.

It takes about ____
years.

Answer 1

No answers here.

Explanation:

But let me guess this is from Ms. Wong?

Answer 2

12 years

Explanation:

slope= y2-y1/x2-x1

(2,7), (0,0)

7-0/2-0

7/2

y= 7/2x

42= 7/2x

x= 12