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31.
hazardous waste recycling facilities will only collect batteries.

true

false

32.
which of the following is an advantage of nuclear energy?

it does not produce solid waste.

it is cost efficient.

it does not produce air pollution.

it poses no safety risks.
33.
in the unites states, which of the following would increase energy efficiency?

turning thermostats up in the winter and down in the summer

converting all lights to incandescent light bulbs

using public transportation and developing more efficient engines for cars

reducing insulation in homes and businesses
34.
hydroelectric power is a good source of heat energy.

true

false
35.
through mineral exploration, mining companies can identify areas where there may be valuable mineral resources.

true

false

Ihave a music player on my phone. i can buy songs, add them to playlists and play them. obviously it would be redundant to store each song in each playlist; each playlist is just a list of pointers to the songs. for this lab you will simulate this behavior. your program will need to have options to: add songs to the system library (you will store the text of the first line of the song, rather than the audio) add playlists add songs to a playlist list playlists play a playlist list all of the songs in the library with a count of how many times each song has been played remove a song from a playlist remove a playlist remove a song from the library (and thus from all playlists that contain it) note that we will not be checking many error cases. in real programming this would be bad, you should usually try to recognize and respond to as many types of errors as you can. in the context of class we are trying to acquaint you with as many concepts as possible, so for the sake of educational efficiency we will not be checking most errors in this lab, you may assume that your user provides correct input. you may add all appropriate error testing if you wish, but we will not be testing for it.

When is it appropriate to use an absolute reference

The "instance" relationship shows that something is an object of a