Express Alegraically. Debbie has three times the number of books Tiffany has. If Tiffany has x books, how many does Debbie have?

What is the value of x when x + 7 = 21?

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis.y = 7ex, y = 7e^-x, x = 1; about the y-axis

Which rectangle if translated 6 units right and 16 units down and the rotated 90° clockwise about the point (4, -11) will result in rectangle e?