In 2009, two tickets to a Certain American band's concert and two tickets to a certain British band's concert cost, on average, a total of $556. At those prices, four tickets to see this American band and two tickets to see this British band cost $798. What was the average cost of these American and British band tickets in 2009?

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%