1. Let V be the volume of the solid that lies under the graph of {image} and above the rectangle given by {image} We use the lines x = 6 and y = 8 to divide R into subrectangles. Find the Riemann sum using lower left corners. Select the correct answer. The choices are rounded to the nearest hundredth.
47.59
19.67 2
3.87
69.64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. Evaluate the double integral by first identifying it as the volume of a solid. {image} {image}24 12
-36
-24
-12 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. Which of the following functions is pictured? {applet}
{image} 1. 2. 3. 4. 5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50