Two communications companies offer calling plans. With Company X, it costs 35¢ to connect and then 4e for each minute. With Company Y, it costs 15¢ to connect and then 3¢ for each minute. Write
and simplify an expression that represents how much more Company X charges, in cents, for n
minutes.

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 difference between the equations of a vertical and a horizontal line?

Which number produces an irrational number multiplied by 1/3