There are a few necessities of life. Among the most important are water and food. A person can only live a few days without water. People would also suggest that some kind of shelter is a necessity.
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given head (nice lol but its actually standard of living)
time,action,space,matter,life
absolute value just means to make a number positive. if the number is already positive then absolute value does nothing. the purpoes of absolute value is to take away the negative sign which can be helpful in real life situations.
The displacement, from the vertical, of a child on a swing, or a pendulum.
Time. Time cannot be negative, only positive.