Answer:
The correct answers are:
a) -100
b) +32
c) +25
Explanation:
a) The integer that represents '100 feet above sea level' is +100. The opposite integer is -100. In this case zero means sea level, so:
- above sea level the quantities are positive
- below sea level the quantities are negative
b) The integer that represents '32°C below zero' is -32. The opposite integer is +32. In this case zero means 0°C which is the water melting temperature (temperature when water passes from solid to liquid), so:
- above zero the quantities are positive
- below zero the quantities are negative
c) The integer that represents 'a withdrawal of $25' is -25. The opposite integer is +25. In this case zero means no entrances and no withdrawals, so:
- entrances are positive
- withdrawals are negative