Question 1: Solve this formula for the variable :

Question 2: Solve this formula for the variable R:

Question 3: The intensity of light as measured from a light bulb varies inversely as the square of the distance "d" from the bulb. Suppose that when the distance is 5 m. What would the light intensity be 10m from the bulb?

We know that I varies inversely to the square of the distance, d. In another words:

for some constant k.

We can work k out by substituting

, therefore,

For d = 10,

Question 4: Write a radical expression with an index of 3 and a radicand of (x - 5)^9. Simplify it as much as possible.

This question simply refers to:

This would be the simplest form without expanding that.