Posted by **Lori** on Wednesday, August 1, 2012 at 4:11pm.

A certain mountain has an elevation of 19,583 feet. In 1907, the glacier on this peak covered 10 acres.By 2002, this glacier had melted to only 1 acre. (a) Assume this glacier melted at a constant rate each year. Find this yearly rate. (b)Use your answer from part (a)to write a linear equation that gives the acreage A of this glacier t years past 1907.

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**Steve**, Wednesday, August 1, 2012 at 4:24pm
a constant rate in acres/year, or a constant rate as a %age of the glacier's area?

In the first case, it was reduced by 9 acres in 95 years, or .0947 acres/yr

In the second case, it was reduced to 10% in 95 years, at a rate of 2.4%/yr

I guess you want .0947 acres/yr, since it's asking for a linear equation.

A = 10 - .0947x where x=years since 1907.

Extra credit: At that rate, when will the glacier be gone?

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**Lori**, Wednesday, August 1, 2012 at 4:31pm
Yes, I want the .0947 so that I could do the linear equation. Since the linear equation is A=10-.947(95)which means A = 1.0035?

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**Lori**, Wednesday, August 1, 2012 at 4:34pm
I have to round the .0947 to the nearest thousandth so it would be .09?

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**Ms. Sue**, Wednesday, August 1, 2012 at 4:37pm
You rounded to the nearest hundredth.

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**Lori**, Wednesday, August 1, 2012 at 4:38pm
So then it is .095?

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**Ms. Sue**, Wednesday, August 1, 2012 at 4:39pm
Right. 0.095

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**Lori**, Wednesday, August 1, 2012 at 4:40pm
Thank you!

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