If the average (arithmetic mean) of t and t+2 is x and the average of t and t-2 is y, what is the average of x and y?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant. given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.