Each level of an energy pyramid is smaller than the one before it.
what is happening to the lost energy?
select one:
the energy is destroyed.
the energy cycles back into the previous layer of the pyramid.
the energy is lost as heat.
the energy is converted to mass.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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.