book Maths Puzzle Numerical Ability

Help. I do not understand how to do this. My Algebra book says to use a graphing calculator. Solve the circumference formula for r. If Y1 is the circumference, what expression

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what is the answer to -R=38 Leo's garden, which is 6m wide, has the same area as Jen's garden, which is 8 m wide. Find the lengths of the two rectangular gardens if Leo's garden is 3m longer than Jen's garden