Find the vertex and y-intercept of the quadratic functio. 18. y=-x2 + 6x -8

19. y = x2 - 8x + 11

20. y = 3x2 + 18x + 10

21. y = -2x2 - 12x-5

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

What is the measure of angle x? answer