exam Maths Puzzle Numerical Ability

how do you simplify 1/b^-7 x b^5?

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exam Other Question

Hello, I am having trouble figuring out this problem
Write a recursive formula that generates the terms of the following:
1,3,9,27,...

Thanks in advanced I need to solve for w and find the solution set for the following: Sqrt (5w-1) = w-3. I multiplied both sides by sqrt (5w-1) and got (5w-1) = w-3(sqrt (5w-1).