A formula for determining the finite sum, S, of an arithmetic sequence of numbers is S= n/2 (a+ b), where n is the number of terms, a is the first term, and b is the last term. Express b in terms of a, S, and n.​

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?