Let x be a constant. The 5th term of an arithmetic sequence is a = 4x – 3. The 9th term of the sequence is a, = 12x + 9 Find the first term of the sequence. Write your answer in simplest form.

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.

How do you solve a question like this?

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?