Which of the following expressions represents the simplified version of the expression below? (12x4−4x3+7x+6)+(3x2−4x+14)

A. 15x6−4x3+3x+20
B. 12x4−4x3+3x2+3x+20
C. 15x6−8x4+21x+6
D. 12x4−x3+3x+20

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2