Which statement is true?
a. |-8| < |8|
b. |-2| > 1
c. |-7| = -7
d. |12| > |-15|

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62