9. An equation representing the height of a burning candle is H = 2(9 - 21), where H is the height of the candle in cm and
t is the amount of time that the candle has been burning in minutes,
.
How long will it take for the candle to burn down to a height of 4 cm?
a. 2 min
b. 3.5 min
c. 5.5 min
d. 7 min

Country carpets charges $22 per square yard for carpeting, and an additional installation fee of $100. city carpets charges $25 per square yard for the same carpeting, and an additional installation fee of $70

Fred has a total of 62 dvd and cd. if the number of cd is three more than two times the number of dvd, how many cd does he have?

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.