I need help please 25 points and a if correct In a sequence of numbers, a3=21, a4=26, a5=31, a6=36, and a7=41.

Which equation can be used to find the nth term of the sequence, an?

an=7n

an=7n+21

an=5n+21

an=5n+6

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.

What is the slope of the line shown below?

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"