a) Use the formula

Calculate the point using your ratio and your two points (be careful, order matters).

Then compare your point to the one given and you should be able to find .

c) Using the formula

We get:

From here you can take cases, or you can use the definition and square both sides to solve for .

Should that be read as "Q in the middle of P and R"? Or is it just saying the same thing twice?

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