Suppose that a program performs an intermixed sequence of (stack) push and pop operations. The push operations put the integers 0 through 9 in order onto the stack; the pop operations print out the return values. Which of the following sequence(s) could not occur?

a. 4321098765
b. 2143658790
c. 0465381729
d. 4687532901

Who can provide you with a new password when you have forgotten your old one? your provide you with a new password in case you forget your old one.

Scientists have changed the model of the atom as they have gathered new evidence. one of the atomic models is shown below. what experimental evidence led to the development of this atomic model from the one before it? a few of the positive particles aimed at a gold foil seemed to bounce back. the colors of light emitted from heated atoms had very specific energies. experiments with water vapor showed that elements combine in specific proportions. cathode rays were bent in the same way whenever a magnet was brought near them.

Hazel has just finished adding pictures to her holiday newsletter. she decides to crop an image. what is cropping an image?