What are the expressions to fin the radius of an object having a circumference of 46 feet

Since the equation for solving circumference is 2r, you can see that 2r = 46. Dividing 2 on both sides will give you r, or the radius.
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First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

The only number less than 8 that can equal 12 would be 6, 36 is the dividend