Newton's Cooling Law HELP!

[gwen01]

I placed into math 107 at my community college and it is way over my head. I desperately need help with a take home test that is due tomorrow. Here's the problem:

A piece of metal is removed from an oven at 550 degrees. After 30 minutes it has cooled to 425 degrees. Room temperature is 60 degrees.

Q1. What is the temperature after one hour 15 minutes?
Q2. How long until it reaches 100 degrees?

I was sick the day we learned Newton's Law of Cooling and i cannot figure this out on my own, can someone please help me figure this out step by step? Thanks!

 

[stapel]

A piece of metal is removed from an oven at 550 degrees. After 30 minutes it has cooled to 425 degrees. Room temperature is 60 degrees.

You have posted this now at least four times (with two or more of the other copies having been deleted by now). Kindly cease, and instead reply to your one remaining thread in the "Calculus" forum. Thank you.

Eliz.