4. Below is a level curve plot of g(r, y) on the region, R, with 5

ith 5 S lurid 10. 4. Below is a level curve plot of y) on the region', (a) Using Ax = Ay 2, find double Riemann stuns, whicl 'l re reasonable over and underestimates for g(:r, y) dA. ha t:he exact average value of g over the region (b) Suppose it can be determined that 10 11 age 10