The hight, the feet, of a javelin t seconds afther it is moldeled by the function (t) =4t^2 + 24t + 6. afther how many seconds does the javelin reah its maximum height of 42 feet?

The max height will be reached after 3 seconds.

You have a typo in your equation. For this type of quadratic equation, it always starts out with a negative coefficient of the t squared term.

To find the x-coordinate of the vertex, we just need to use the expression: -b/2a.

Then, we have:

-24 / (2(-4))

-24 / -8

3

To find the discount, you need to multiply the rate by the original price
So we get: 



So, the discount is 39.4% 
Hope this Helps :)