If f^-1(x) is the inverse of f(x), which statement must be true?

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%