Which operations are commutative and associative?

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.