Find the area of the region bounded by the curves y= sin^-1(x/6), y=0, and x=6 obtained by integrating with respect to y. your work must include the definite integral and the antiderivative.

Answer this question only if you know the answer! 30 points and

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?