Please please help me I really need help please

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

Which of the following is another way to express the difference between -5 and 8?

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?