Struggling with double integrals, Any help is greatly appreciated =D

Find ffRf(a:,y) (114 where f(:c,y) : a: and R : [1,4] X [3,9]. ffR aw) M = a: 2 7 1 If] f($) (ix 2 5 and f g[:t:) d2: = 5, what is the value of ff mlzy) dA where D is the rectangle: 5 S a: S 7, 2 S y S 1'? 5 2 D 3 Calculate the double integral 1.1111012: + By + 24) dA where R is the region: 0 g :1: S 3, 0 S y S 2. 4 Calculate the double integral ffzcosm + y) dA where R is the region: 0 S :1: S g, 0 S y S % 5 For each of the integrals below, decide (without calculation) whether the integrals are positive, negative, or zero. Let D be the region inside the unit circle centered on the origin, Rbe the right half 01 D, T be the top half of D. L be the left hall of D. la] 11336124 is positive v [b] fT(:B2 +y2)dA is zero v l8] fL(y2 + if) dA is zero v N] nydA is zero v ? . Note: You can negative ton this problem. zero