1. Three Rectangles are used to estimate the area under the curve, y=x^2+4, from x=0 to x=6. Using the right-hand rectangular approximation method, what is the appropriate area under the curve for the given interval? A. 47 B. 64 C. 68 D. 94 E. 136 2. Four rectangles are used to estimate the area under the curve, y= x^3, from x=0, to x=12. Using the left-hand rectangular approximation method, what is the approximation area under the curve for the given interval? A. 972 B. 2,700 C. 2,916 D. 5,022 E. 8,100