We are given an enumeration of A by a 1-1 correspondence
f : N → A. This enumeration has no repetitions.
Hint. Prove that you can use the enumeration f to obtain a different enumeration where each member of A is enumerated infinitely many times.
You will find the traversal with north-east arrows, profitable. Traversal of what? (This I leave to you :)

The scatter plot graph shows the average annual income for a certain profession based on the number of years of experience which of the following is most likely to be the equation of the trend line for this set of data? a. i=5350e +37100 b. i=5350e-37100 c. i=5350e d. e=5350e+37100

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.

Hi, can anyone show me how to do this problem? 100 points for this. in advance