For the system below:
solve the system by the linear combination method. show all work carefully.
check your answer.

a-2b=3
a+b=2(b+3)

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 37 hours and the median is 33.2 hours. twenty-four of the families in the sample turned on the television for 22 hours or less for the week. the 13th percentile of the data is 22 hours. approximately how many families are in the sample? round your answer to the nearest integer.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?