Find three consecutive odd integers that have an average of 13

The numbers are 11,13, and 15.

First, since the average is 13, and it is into three values, multiply 13 by 3 to get 39. Now, use the formula, x+x+2+x+4 to get your answer.

Simplify the formula into 3x+6=39.
First, subtract 6 from both sides to get 3x+=33. Now, divide by three to get 11. Finally, add 2 and 4 because that was how we wrote it in the original equation, and you get your answer

The vertex of the quadratic function is (1.5, -.75)