Find a formula for the nth term of the arithmetic sequence.
First term -12
Common difference 4
an = 4n + [?]

Determine the relationship of ab and cd given the following points

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.

Which expression gives the area of the triangle shown below