A certain mountain has an elevation of 19,485 feet. In 1918,the glacier on this peak covered 4 acres. By 2002 this glacier had melted to only 1 acre.
Assume that this glacier melted at a constant rate each year. Find this yearly rate.
Use your answer from part (a) to write a linear equation that gives the acreage A of this glacier t years past 1918.
The yearly rate of change is --- acres/year.
What is the equation that gives the acreage of the glacier t years after 1918?
A=

Question

A certain mountain has an elevation of 19,485 feet.  In 1918,the glacier on this peak covered 4 acres.  By 2002 this glacier had melted to only 1 acre.  
Assume that this glacier melted at a constant rate each year.  Find this yearly rate.  
Use your answer from part (a) to write a linear equation that gives the acreage A of this glacier t years past 1918.  
The yearly rate of change is --- acres/year.  
What is the equation that gives the acreage of the glacier t years after 1918? 
A=