What does this mean?
"9!"
I did not learn this yet.

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?