Simplify the square root of 864. i cant remember this, tell me how you got the answer.

Which expression gives you the distance between the points (5,1)and(9,-6)

Hey hotel charges guests $19.75 a day to rent five video games at this rate which expression can be used to determine the charge for renting nine video games for one day at this hotel? pls

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?