Both two question please provide detail thx

Q: 3 - 10 marks. Use a double integral to find the volume of the solid shown in the figure. Uploaded files Drag & drop files here or click to upload (pdf, jpg and png files are supported) Q: 4 - 10 marks. The population density of a certain city is given by the function 70, 000, |xyl f ( x, y ) = (x2 + 20) (12 + 36) where the origin (0, 0) gives the location of the city centre. Find the population inside the rectangular area described by R = (x, y), |, -15