8) A crowd gathers around a movie star, forming a circle. The area taken up by the crowd
increases at a rate of 9n ft2/sec. How fast is the radius of the crowd increasing when the
radius is 11 ft?

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

Ais c multiple rthvjjbv