exam Maths Puzzle Numerical Ability

how would i do this? Indicate the formula for the following conditions
p to the c power(n,R)=

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exam Other Question

Given square ABCD with AB= 2x+1 and CD= 5x-19 what is the perimeter of the square? 2 - 2/3x = 4/5x

I have to find for X, but the choices for answers are
A. 1/11
B. 2/3
C. 15/11

I keep on getting 8/15 though. please help.