A formula for determining the infinite sum, Sof 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, Sand n. (WILL MARK BRAINILIST!!)

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

If chord ab is congruent to chord cd, then what must be true about ef and eg?