book Maths Puzzle Numerical Ability

I was trying to find out what "i" equals from the Ordinary Annuity Formula.

Fv= P[ ((1+i)^n -1)/i ]. The closest I've come to was Fv

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the sqaure root of 2x+5 = the sqaure root of 3x+1 Hello I'm sort of confused here about how to solve each formula for the given variable 33.) E=IR;for R (35.) V=lwh; for w (43.) p=a+b+c; for b (49.) K= 1/2mvsquare; for m etc. do y