book Maths Puzzle Numerical Ability

Square root of (2x-3) + x = 3

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book Other Question

im so confused.. it says to fill the missing value..
Principal=4000 Start Date=June 16 2005 End Date= ? Interest Rate PA%=7 Interest=$262.36...
Ya im like lost no clue how to sol
Suppose that $2,500 is invested at 7% compounded quarterly. How much money will be in the account in
(A) 3/4 year?
(B) 15 years?