exam Maths Puzzle Numerical Ability

I=E over R plus r,R
I need to know what the R is.
Thanks

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FIND AN EXPONENTIAL FUNCTION OF THE FORM f(x)=ba^x+c WITH y-INTERCEPT 2, HORIZONTAL ASYMPTOTE y=-2, THAT PASSES THROUGH THE POINT P(1,4). Using my weight of 159lbs write and solve a porportion to find the number of calories I would burn if I performed one of the activitys in the table below for 60 minutes. Then how m