What is an internal heat engine and what does it do?

Subject: Geology

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12