R= c/2pi
Swap the sides of the equation
Divide both sides of the equation by 2pi
Write the solution in parametric form

That is the number of hours he will spend answering phone calls.
Brian is correct. Because when you add or subtract fractions with common denominators, it follows the rule of addition. The denominator stays the same and you simply need to get the sum of the numerators. It is pretty straightforward. For example:
Pi IS an: irrational number, a real number
Pi is NOT a: whole number, natural number, rational number, integer
Answer: B.

Step-by-step explanation:
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