A group of students is arranging squares into layers to create a project. The first layer has 4 squares. The second layer has 8 squares. Which formula represents ab arithmetic explicit formula to determine the number of squares in each layer? A. F(1) = 4; f(n) = 4 x d(n - 1), n > 0

B. F(1) = 4; f(n) = 4 x d(n + 1), n > 0

C. F(1) = 4; f(n) = 4 + d(n + 1), n = 0

D. F(1) = 4; f(n) = 4 + d(n - 1), n > 0​

Which of these choices show a pair of equivalent expressions?

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area