Asoccer ball is kicked into the air. its height is approximated by the equation h(t)= -5t^2+45t, where h is the height in meters and t is the time is seconds.

a.)what are the x-intercepts? when does the soccer ball hit the ground?

b.)what are the coordinates of the vertex? what is the max height of the soccer ball? how long does it take to hit it's max height?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

What’s -11-33k and factor each expression completely

Which of the following parabolas opens down?