exam Maths Puzzle Numerical Ability

I have to simplify and assume that all variables represent positive numbers... Can you help me please?

Page 526
Number 34

square root of 20

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exam Other Question

Which of the following intervals represents the solution set of the inequality -3 is less than or equal to 2x+1<7
1.) (-3,7)
2.) (-2,3)
3.) [-3,7)
4.) [-2,3)
Solve.

The square root of x-1 = x-3

Can someone please explain this? Thank you.