A certain mountain has an elevation of 19,327 feet. In 1908, the glacier on the peak covered 5 acres. By 2002, this glacier had melted to only 1 acre.
a) Assume that this glacier melted at a constant rate each year. Find this yearly rate.
b) Use your answer for the part (a) to write the linear equation that gives the acreage A of this glacier t years past 1908.
The yearly rate of change is ____ acres/year.
What is the equation that gives the acreage of the glacier t years after 1908?

Question

A certain mountain has an elevation of 19,327 feet. In 1908, the glacier on the peak covered 5 acres. By 2002, this glacier had melted to only 1 acre. 
a) Assume that this glacier melted at a constant rate each year. Find this yearly rate. 
b) Use your answer for the part (a) to write the linear equation that gives the acreage A of this glacier t years past 1908. 
The yearly rate of change is ____ acres/year.
What is the equation that gives the acreage of the glacier t years after 1908?