exam Maths Puzzle Numerical Ability

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).

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exam Other Question

how do you simplify 1/b^-7 x b^5? The budget deficit for Central City can be modeled by the equation
D = 0.5n + 6.5 where n is the number of years since 1990 and D is the deficit in millions of dollars.
Graph the equation for n ranging from 0 to 20.