Suppose you have a cache of radium, which has a half-life of approximately 1590 years. how long would you have to wait for 1/5 of it to disappear?

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.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

What’s -11-33k and factor each expression completely