Find the average value of the function f over the given region. f (x comma y )equals sine seven halves (x plus y )over the square 0less than or equalsxless than or equalsStartFraction pi Over 7 EndFraction , 0less than or equalsyless than or equalsStartFraction pi Over 7 EndFraction .

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total