Evaluate the line integral: int(x^2 dx +y^2 dy) ∫cx2dx+y2dy c consists of the arc of the circle x^2+y^2=4 from (2,0) to (0,2) followed by the line segment from (0,2) to (4,3)

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?