book Maths Puzzle Numerical Ability

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

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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
The sum of the counting numbers from 1 to 5 can be represented by drawing a triangle of dots as shown at left. A rectangle can be formed by copying the triangle and rotating it. Th