Item 18 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.

b

step-by-step explanation:

yes

step-by-step explanation:

yes

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;

answer is  

a.

93.98 sq. in.

hope you got it chief